pgsql: Implement has_sequence_privilege() Add family of functions that

Log Message:
-----------
Implement has_sequence_privilege()

Add family of functions that did not exist earlier,
mainly due to historical omission. Original patch by
Abhijit Menon-Sen, with review and modifications by
Joe Conway. catversion.h bumped.

Modified Files:
--------------
pgsql/doc/src/sgml:
func.sgml (r1.483 -> r1.484)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/func.sgml?r1=1.483&r2=1.484)
pgsql/src/backend/utils/adt:
acl.c (r1.148 -> r1.149)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/backend/utils/adt/acl.c?r1=1.148&r2=1.149)
pgsql/src/include/catalog:
catversion.h (r1.535 -> r1.536)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/include/catalog/catversion.h?r1=1.535&r2=1.536)
pg_proc.h (r1.547 -> r1.548)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/include/catalog/pg_proc.h?r1=1.547&r2=1.548)
pgsql/src/include/utils:
builtins.h (r1.336 -> r1.337)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/include/utils/builtins.h?r1=1.336&r2=1.337)
pgsql/src/test/regress/expected:
privileges.out (r1.46 -> r1.47)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/test/regress/expected/privileges.out?r1=1.46&r2=1.47)
pgsql/src/test/regress/sql:
privileges.sql (r1.25 -> r1.26)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/test/regress/sql/privileges.sql?r1=1.25&r2=1.26)