pgsql: Change heap_modifytuple() to require a TupleDesc rather than a

Log Message:
-----------
Change heap_modifytuple() to require a TupleDesc rather than a
Relation. Patch from Alvaro Herrera, minor editorializing by
Neil Conway.

Modified Files:
--------------
pgsql/src/backend/access/common:
heaptuple.c (r1.95 -> r1.96)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/access/common/heaptuple.c.diff?r1=1.95&r2=1.96)
pgsql/src/backend/catalog:
aclchk.c (r1.108 -> r1.109)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/catalog/aclchk.c.diff?r1=1.108&r2=1.109)
pg_operator.c (r1.87 -> r1.88)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/catalog/pg_operator.c.diff?r1=1.87&r2=1.88)
pg_proc.c (r1.122 -> r1.123)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/catalog/pg_proc.c.diff?r1=1.122&r2=1.123)
pg_type.c (r1.97 -> r1.98)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/catalog/pg_type.c.diff?r1=1.97&r2=1.98)
pgsql/src/backend/commands:
analyze.c (r1.80 -> r1.81)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/commands/analyze.c.diff?r1=1.80&r2=1.81)
async.c (r1.118 -> r1.119)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/commands/async.c.diff?r1=1.118&r2=1.119)
comment.c (r1.80 -> r1.81)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/commands/comment.c.diff?r1=1.80&r2=1.81)
dbcommands.c (r1.148 -> r1.149)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/commands/dbcommands.c.diff?r1=1.148&r2=1.149)
functioncmds.c (r1.53 -> r1.54)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/commands/functioncmds.c.diff?r1=1.53&r2=1.54)
schemacmds.c (r1.27 -> r1.28)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/commands/schemacmds.c.diff?r1=1.27&r2=1.28)
tablecmds.c (r1.144 -> r1.145)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/commands/tablecmds.c.diff?r1=1.144&r2=1.145)
tablespace.c (r1.15 -> r1.16)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/commands/tablespace.c.diff?r1=1.15&r2=1.16)
typecmds.c (r1.66 -> r1.67)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/commands/typecmds.c.diff?r1=1.66&r2=1.67)
user.c (r1.147 -> r1.148)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/commands/user.c.diff?r1=1.147&r2=1.148)
pgsql/src/backend/rewrite:
rewriteDefine.c (r1.100 -> r1.101)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/rewrite/rewriteDefine.c.diff?r1=1.100&r2=1.101)
pgsql/src/backend/storage/large_object:
inv_api.c (r1.108 -> r1.109)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/storage/large_object/inv_api.c.diff?r1=1.108&r2=1.109)
pgsql/src/include/access:
heapam.h (r1.93 -> r1.94)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/include/access/heapam.h.diff?r1=1.93&r2=1.94)