pgsql: First phase of OUT-parameters project.

Log Message:
-----------
First phase of OUT-parameters project. We can now define and use SQL
functions with OUT parameters. The various PLs still need work, as does
pg_dump. Rudimentary docs and regression tests included.

Modified Files:
--------------
pgsql/doc/src/sgml/ref:
create_function.sgml (r1.64 -> r1.65)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/ref/create_function.sgml.diff?r1=1.64&r2=1.65)
pgsql/doc/src/sgml:
xfunc.sgml (r1.101 -> r1.102)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/xfunc.sgml.diff?r1=1.101&r2=1.102)
pgsql/src/backend/access/common:
tupdesc.c (r1.109 -> r1.110)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/access/common/tupdesc.c.diff?r1=1.109&r2=1.110)
pgsql/src/backend/catalog:
pg_aggregate.c (r1.71 -> r1.72)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/catalog/pg_aggregate.c.diff?r1=1.71&r2=1.72)
pg_proc.c (r1.125 -> r1.126)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/catalog/pg_proc.c.diff?r1=1.125&r2=1.126)
pgsql/src/backend/commands:
functioncmds.c (r1.58 -> r1.59)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/commands/functioncmds.c.diff?r1=1.58&r2=1.59)
pgsql/src/backend/executor:
functions.c (r1.94 -> r1.95)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/executor/functions.c.diff?r1=1.94&r2=1.95)
nodeFunctionscan.c (r1.31 -> r1.32)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/executor/nodeFunctionscan.c.diff?r1=1.31&r2=1.32)
pgsql/src/backend/optimizer/util:
clauses.c (r1.191 -> r1.192)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/optimizer/util/clauses.c.diff?r1=1.191&r2=1.192)
pgsql/src/backend/parser:
gram.y (r2.485 -> r2.486)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/parser/gram.y.diff?r1=2.485&r2=2.486)
parse_func.c (r1.176 -> r1.177)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/parser/parse_func.c.diff?r1=1.176&r2=1.177)
parse_relation.c (r1.102 -> r1.103)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/parser/parse_relation.c.diff?r1=1.102&r2=1.103)
pgsql/src/backend/utils/cache:
lsyscache.c (r1.121 -> r1.122)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/utils/cache/lsyscache.c.diff?r1=1.121&r2=1.122)
pgsql/src/backend/utils/fmgr:
fmgr.c (r1.92 -> r1.93)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/utils/fmgr/fmgr.c.diff?r1=1.92&r2=1.93)
funcapi.c (r1.18 -> r1.19)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/utils/fmgr/funcapi.c.diff?r1=1.18&r2=1.19)
pgsql/src/include/catalog:
pg_proc.h (r1.356 -> r1.357)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/include/catalog/pg_proc.h.diff?r1=1.356&r2=1.357)
pgsql/src/include/executor:
functions.h (r1.24 -> r1.25)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/include/executor/functions.h.diff?r1=1.24&r2=1.25)
pgsql/src/include:
fmgr.h (r1.37 -> r1.38)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/include/fmgr.h.diff?r1=1.37&r2=1.38)
funcapi.h (r1.15 -> r1.16)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/include/funcapi.h.diff?r1=1.15&r2=1.16)
pgsql/src/include/utils:
lsyscache.h (r1.95 -> r1.96)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/include/utils/lsyscache.h.diff?r1=1.95&r2=1.96)
pgsql/src/test/regress/expected:
rangefuncs.out (r1.9 -> r1.10)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/test/regress/expected/rangefuncs.out.diff?r1=1.9&r2=1.10)
pgsql/src/test/regress/output:
create_function_2.source (r1.19 -> r1.20)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/test/regress/output/create_function_2.source.diff?r1=1.19&r2=1.20)
pgsql/src/test/regress/sql:
rangefuncs.sql (r1.5 -> r1.6)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/test/regress/sql/rangefuncs.sql.diff?r1=1.5&r2=1.6)