pgsql: Wording cleanup for error messages.

Log Message:
-----------
Wording cleanup for error messages. Also change can't -> cannot.

Standard English uses "may", "can", and "might" in different ways:

may - permission, "You may borrow my rake."

can - ability, "I can lift that log."

might - possibility, "It might rain today."

Unfortunately, in conversational English, their use is often mixed, as
in, "You may use this variable to do X", when in fact, "can" is a better
choice. Similarly, "It may crash" is better stated, "It might crash".

Modified Files:
--------------
pgsql/contrib/spi:
autoinc.c (r1.12 -> r1.13)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/contrib/spi/autoinc.c.diff?r1=1.12&r2=1.13)
insert_username.c (r1.14 -> r1.15)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/contrib/spi/insert_username.c.diff?r1=1.14&r2=1.15)
moddatetime.c (r1.13 -> r1.14)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/contrib/spi/moddatetime.c.diff?r1=1.13&r2=1.14)
refint.c (r1.30 -> r1.31)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/contrib/spi/refint.c.diff?r1=1.30&r2=1.31)
timetravel.c (r1.25 -> r1.26)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/contrib/spi/timetravel.c.diff?r1=1.25&r2=1.26)
pgsql/contrib/tsearch2:
dict_thesaurus.c (r1.7 -> r1.8)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/contrib/tsearch2/dict_thesaurus.c.diff?r1=1.7&r2=1.8)
tsvector.c (r1.26 -> r1.27)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/contrib/tsearch2/tsvector.c.diff?r1=1.26&r2=1.27)
pgsql/doc/src/sgml:
ecpg.sgml (r1.79 -> r1.80)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/ecpg.sgml.diff?r1=1.79&r2=1.80)
gin.sgml (r2.9 -> r2.10)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/gin.sgml.diff?r1=2.9&r2=2.10)
installation.sgml (r1.280 -> r1.281)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/installation.sgml.diff?r1=1.280&r2=1.281)
lobj.sgml (r1.43 -> r1.44)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/lobj.sgml.diff?r1=1.43&r2=1.44)
maintenance.sgml (r1.69 -> r1.70)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/maintenance.sgml.diff?r1=1.69&r2=1.70)
perform.sgml (r1.62 -> r1.63)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/perform.sgml.diff?r1=1.62&r2=1.63)
plperl.sgml (r2.62 -> r2.63)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/plperl.sgml.diff?r1=2.62&r2=2.63)
queries.sgml (r1.43 -> r1.44)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/queries.sgml.diff?r1=1.43&r2=1.44)
release.sgml (r1.495 -> r1.496)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/release.sgml.diff?r1=1.495&r2=1.496)
rules.sgml (r1.50 -> r1.51)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/rules.sgml.diff?r1=1.50&r2=1.51)
sources.sgml (r2.23 -> r2.24)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/sources.sgml.diff?r1=2.23&r2=2.24)
spi.sgml (r1.51 -> r1.52)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/spi.sgml.diff?r1=1.51&r2=1.52)
sql.sgml (r1.44 -> r1.45)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/sql.sgml.diff?r1=1.44&r2=1.45)
syntax.sgml (r1.113 -> r1.114)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/syntax.sgml.diff?r1=1.113&r2=1.114)
typeconv.sgml (r1.50 -> r1.51)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/typeconv.sgml.diff?r1=1.50&r2=1.51)
xfunc.sgml (r1.124 -> r1.125)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/xfunc.sgml.diff?r1=1.124&r2=1.125)
xoper.sgml (r1.40 -> r1.41)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/xoper.sgml.diff?r1=1.40&r2=1.41)
pgsql/doc/src/sgml/ref:
create_function.sgml (r1.72 -> r1.73)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/ref/create_function.sgml.diff?r1=1.72&r2=1.73)
create_rule.sgml (r1.50 -> r1.51)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/ref/create_rule.sgml.diff?r1=1.50&r2=1.51)
create_trigger.sgml (r1.46 -> r1.47)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/ref/create_trigger.sgml.diff?r1=1.46&r2=1.47)
initdb.sgml (r1.39 -> r1.40)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/ref/initdb.sgml.diff?r1=1.39&r2=1.40)
notify.sgml (r1.29 -> r1.30)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/ref/notify.sgml.diff?r1=1.29&r2=1.30)
psql-ref.sgml (r1.182 -> r1.183)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/ref/psql-ref.sgml.diff?r1=1.182&r2=1.183)
rollback_to.sgml (r1.8 -> r1.9)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/ref/rollback_to.sgml.diff?r1=1.8&r2=1.9)
select.sgml (r1.98 -> r1.99)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/ref/select.sgml.diff?r1=1.98&r2=1.99)
pgsql/src/backend/access/gist:
gistxlog.c (r1.25 -> r1.26)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/access/gist/gistxlog.c.diff?r1=1.25&r2=1.26)
pgsql/src/backend/access/hash:
hashscan.c (r1.41 -> r1.42)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/access/hash/hashscan.c.diff?r1=1.41&r2=1.42)
pgsql/src/backend/access/nbtree:
nbtxlog.c (r1.40 -> r1.41)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/access/nbtree/nbtxlog.c.diff?r1=1.40&r2=1.41)
pgsql/src/backend/access/transam:
xact.c (r1.231 -> r1.232)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/access/transam/xact.c.diff?r1=1.231&r2=1.232)
xlog.c (r1.260 -> r1.261)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/access/transam/xlog.c.diff?r1=1.260&r2=1.261)
pgsql/src/backend/catalog:
aclchk.c (r1.135 -> r1.136)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/catalog/aclchk.c.diff?r1=1.135&r2=1.136)
dependency.c (r1.62 -> r1.63)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/catalog/dependency.c.diff?r1=1.62&r2=1.63)
index.c (r1.277 -> r1.278)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/catalog/index.c.diff?r1=1.277&r2=1.278)
namespace.c (r1.90 -> r1.91)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/catalog/namespace.c.diff?r1=1.90&r2=1.91)
pgsql/src/backend/commands:
cluster.c (r1.155 -> r1.156)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/commands/cluster.c.diff?r1=1.155&r2=1.156)
comment.c (r1.95 -> r1.96)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/commands/comment.c.diff?r1=1.95&r2=1.96)
dbcommands.c (r1.190 -> r1.191)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/commands/dbcommands.c.diff?r1=1.190&r2=1.191)
indexcmds.c (r1.154 -> r1.155)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/commands/indexcmds.c.diff?r1=1.154&r2=1.155)
opclasscmds.c (r1.53 -> r1.54)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/commands/opclasscmds.c.diff?r1=1.53&r2=1.54)
portalcmds.c (r1.58 -> r1.59)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/commands/portalcmds.c.diff?r1=1.58&r2=1.59)
schemacmds.c (r1.42 -> r1.43)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/commands/schemacmds.c.diff?r1=1.42&r2=1.43)
sequence.c (r1.142 -> r1.143)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/commands/sequence.c.diff?r1=1.142&r2=1.143)
tablespace.c (r1.41 -> r1.42)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/commands/tablespace.c.diff?r1=1.41&r2=1.42)
user.c (r1.175 -> r1.176)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/commands/user.c.diff?r1=1.175&r2=1.176)
vacuum.c (r1.343 -> r1.344)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/commands/vacuum.c.diff?r1=1.343&r2=1.344)
pgsql/src/backend/executor:
execQual.c (r1.209 -> r1.210)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/executor/execQual.c.diff?r1=1.209&r2=1.210)
pgsql/src/backend/optimizer/plan:
initsplan.c (r1.128 -> r1.129)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/optimizer/plan/initsplan.c.diff?r1=1.128&r2=1.129)
pgsql/src/backend/optimizer/util:
clauses.c (r1.231 -> r1.232)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/optimizer/util/clauses.c.diff?r1=1.231&r2=1.232)
pgsql/src/backend/parser:
analyze.c (r1.359 -> r1.360)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/parser/analyze.c.diff?r1=1.359&r2=1.360)
gram.y (r2.577 -> r2.578)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/parser/gram.y.diff?r1=2.577&r2=2.578)
parse_agg.c (r1.76 -> r1.77)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/parser/parse_agg.c.diff?r1=1.76&r2=1.77)
parse_clause.c (r1.163 -> r1.164)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/parser/parse_clause.c.diff?r1=1.163&r2=1.164)
parse_func.c (r1.193 -> r1.194)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/parser/parse_func.c.diff?r1=1.193&r2=1.194)
parse_oper.c (r1.93 -> r1.94)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/parser/parse_oper.c.diff?r1=1.93&r2=1.94)
pgsql/src/backend/port/dynloader:
aix.c (r1.18 -> r1.19)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/port/dynloader/aix.c.diff?r1=1.18&r2=1.19)
pgsql/src/backend/regex:
rege_dfa.c (r1.6 -> r1.7)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/regex/rege_dfa.c.diff?r1=1.6&r2=1.7)
pgsql/src/backend/rewrite:
rewriteDefine.c (r1.116 -> r1.117)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/rewrite/rewriteDefine.c.diff?r1=1.116&r2=1.117)
rewriteHandler.c (r1.169 -> r1.170)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/rewrite/rewriteHandler.c.diff?r1=1.169&r2=1.170)
pgsql/src/backend/storage/buffer:
bufmgr.c (r1.214 -> r1.215)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/storage/buffer/bufmgr.c.diff?r1=1.214&r2=1.215)
pgsql/src/backend/storage/lmgr:
lock.c (r1.175 -> r1.176)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/storage/lmgr/lock.c.diff?r1=1.175&r2=1.176)
pgsql/src/backend/utils/adt:
genfile.c (r1.14 -> r1.15)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/utils/adt/genfile.c.diff?r1=1.14&r2=1.15)
int.c (r1.77 -> r1.78)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/utils/adt/int.c.diff?r1=1.77&r2=1.78)
int8.c (r1.63 -> r1.64)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/utils/adt/int8.c.diff?r1=1.63&r2=1.64)
pgsql/src/backend/utils/fmgr:
funcapi.c (r1.32 -> r1.33)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/utils/fmgr/funcapi.c.diff?r1=1.32&r2=1.33)
pgsql/src/backend/utils/init:
miscinit.c (r1.160 -> r1.161)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/utils/init/miscinit.c.diff?r1=1.160&r2=1.161)
pgsql/src/backend/utils/misc:
guc.c (r1.371 -> r1.372)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/utils/misc/guc.c.diff?r1=1.371&r2=1.372)
pgsql/src/bin/initdb:
initdb.c (r1.130 -> r1.131)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/bin/initdb/initdb.c.diff?r1=1.130&r2=1.131)
pgsql/src/bin/pg_ctl:
pg_ctl.c (r1.76 -> r1.77)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/bin/pg_ctl/pg_ctl.c.diff?r1=1.76&r2=1.77)
pgsql/src/bin/pg_dump:
pg_backup_archiver.c (r1.140 -> r1.141)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/bin/pg_dump/pg_backup_archiver.c.diff?r1=1.140&r2=1.141)
pgsql/src/bin/pg_resetxlog:
pg_resetxlog.c (r1.55 -> r1.56)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/bin/pg_resetxlog/pg_resetxlog.c.diff?r1=1.55&r2=1.56)
pgsql/src/bin/psql:
startup.c (r1.139 -> r1.140)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/bin/psql/startup.c.diff?r1=1.139&r2=1.140)
pgsql/src/include/regex:
regerrs.h (r1.3 -> r1.4)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/include/regex/regerrs.h.diff?r1=1.3&r2=1.4)
pgsql/src/interfaces/ecpg/preproc:
ecpg.c (r1.96 -> r1.97)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/interfaces/ecpg/preproc/ecpg.c.diff?r1=1.96&r2=1.97)
preproc.y (r1.339 -> r1.340)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/interfaces/ecpg/preproc/preproc.y.diff?r1=1.339&r2=1.340)
pgsql/src/interfaces/libpq:
win32.c (r1.21 -> r1.22)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/interfaces/libpq/win32.c.diff?r1=1.21&r2=1.22)
pgsql/src/pl/plperl:
plperl.c (r1.125 -> r1.126)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/pl/plperl/plperl.c.diff?r1=1.125&r2=1.126)
pgsql/src/pl/plpgsql/src:
gram.y (r1.96 -> r1.97)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/pl/plpgsql/src/gram.y.diff?r1=1.96&r2=1.97)
pl_comp.c (r1.110 -> r1.111)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/pl/plpgsql/src/pl_comp.c.diff?r1=1.110&r2=1.111)
pgsql/src/pl/plpython:
plpython.c (r1.93 -> r1.94)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/pl/plpython/plpython.c.diff?r1=1.93&r2=1.94)
pgsql/src/pl/tcl:
pltcl.c (r1.108 -> r1.109)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/pl/tcl/pltcl.c.diff?r1=1.108&r2=1.109)
pgsql/src/test/examples:
testlo.c (r1.28 -> r1.29)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/test/examples/testlo.c.diff?r1=1.28&r2=1.29)
pgsql/src/test/regress:
pg_regress.c (r1.27 -> r1.28)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/test/regress/pg_regress.c.diff?r1=1.27&r2=1.28)
regress.c (r1.68 -> r1.69)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/test/regress/regress.c.diff?r1=1.68&r2=1.69)
pgsql/src/test/regress/expected:
alter_table.out (r1.99 -> r1.100)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/test/regress/expected/alter_table.out.diff?r1=1.99&r2=1.100)
create_view.out (r1.10 -> r1.11)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/test/regress/expected/create_view.out.diff?r1=1.10&r2=1.11)
geometry.out (r1.24 -> r1.25)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/test/regress/expected/geometry.out.diff?r1=1.24&r2=1.25)
horology.out (r1.64 -> r1.65)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/test/regress/expected/horology.out.diff?r1=1.64&r2=1.65)
privileges.out (r1.35 -> r1.36)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/test/regress/expected/privileges.out.diff?r1=1.35&r2=1.36)
rangefuncs.out (r1.15 -> r1.16)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/test/regress/expected/rangefuncs.out.diff?r1=1.15&r2=1.16)
time.out (r1.12 -> r1.13)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/test/regress/expected/time.out.diff?r1=1.12&r2=1.13)
timetz.out (r1.7 -> r1.8)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/test/regress/expected/timetz.out.diff?r1=1.7&r2=1.8)
transactions.out (r1.14 -> r1.15)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/test/regress/expected/transactions.out.diff?r1=1.14&r2=1.15)
triggers.out (r1.23 -> r1.24)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/test/regress/expected/triggers.out.diff?r1=1.23&r2=1.24)
pgsql/src/test/thread:
thread_test.c (r1.3 -> r1.4)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/test/thread/thread_test.c.diff?r1=1.3&r2=1.4)
pgsql/src/timezone:
zic.c (r1.20 -> r1.21)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/timezone/zic.c.diff?r1=1.20&r2=1.21)
pgsql/src/tools/entab:
entab.c (r1.16 -> r1.17)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/tools/entab/entab.c.diff?r1=1.16&r2=1.17)