pgsql: Tweak the API for per-datatype typmodin functions so that they

Log Message:
-----------
Tweak the API for per-datatype typmodin functions so that they are passed
an array of strings rather than an array of integers, and allow any simple
constant or identifier to be used in typmods; for example
create table foo (f1 widget(42,'23skidoo',point));
Of course the typmodin function has still got to pack this info into a
non-negative int32 for storage, but it's still a useful improvement in
flexibility, especially considering that you can do nearly anything if you
are willing to keep the info in a side table. We can get away with this
change since we have not yet released a version providing user-definable
typmods. Per discussion.

Modified Files:
--------------
pgsql/doc/src/sgml/ref:
create_type.sgml (r1.71 -> r1.72)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/ref/create_type.sgml.diff?r1=1.71&r2=1.72)
pgsql/src/backend/commands:
typecmds.c (r1.104 -> r1.105)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/commands/typecmds.c.diff?r1=1.104&r2=1.105)
pgsql/src/backend/parser:
gram.y (r2.593 -> r2.594)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/parser/gram.y.diff?r1=2.593&r2=2.594)
parse_type.c (r1.90 -> r1.91)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/parser/parse_type.c.diff?r1=1.90&r2=1.91)
pgsql/src/backend/utils/adt:
arrayutils.c (r1.23 -> r1.24)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/utils/adt/arrayutils.c.diff?r1=1.23&r2=1.24)
date.c (r1.132 -> r1.133)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/utils/adt/date.c.diff?r1=1.132&r2=1.133)
numeric.c (r1.104 -> r1.105)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/utils/adt/numeric.c.diff?r1=1.104&r2=1.105)
timestamp.c (r1.177 -> r1.178)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/utils/adt/timestamp.c.diff?r1=1.177&r2=1.178)
varbit.c (r1.53 -> r1.54)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/utils/adt/varbit.c.diff?r1=1.53&r2=1.54)
varchar.c (r1.123 -> r1.124)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/utils/adt/varchar.c.diff?r1=1.123&r2=1.124)
pgsql/src/include/catalog:
catversion.h (r1.411 -> r1.412)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/include/catalog/catversion.h.diff?r1=1.411&r2=1.412)
pg_proc.h (r1.459 -> r1.460)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/include/catalog/pg_proc.h.diff?r1=1.459&r2=1.460)
pg_type.h (r1.185 -> r1.186)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/include/catalog/pg_type.h.diff?r1=1.185&r2=1.186)
pgsql/src/include/utils:
array.h (r1.64 -> r1.65)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/include/utils/array.h.diff?r1=1.64&r2=1.65)
pgsql/src/test/regress/expected:
type_sanity.out (r1.30 -> r1.31)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/test/regress/expected/type_sanity.out.diff?r1=1.30&r2=1.31)
pgsql/src/test/regress/sql:
type_sanity.sql (r1.30 -> r1.31)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/test/regress/sql/type_sanity.sql.diff?r1=1.30&r2=1.31)