pgsql-server: Align GRANT/REVOKE behavior more closely with the SQL

Log Message:
-----------
Align GRANT/REVOKE behavior more closely with the SQL spec, per discussion
of bug report #1150. Also, arrange that the object owner's irrevocable
grant-option permissions are handled implicitly by the system rather than
being listed in the ACL as self-granted rights (which was wrong anyway).
I did not take the further step of showing these permissions in an
explicit 'granted by _SYSTEM' ACL entry, as that seemed more likely to
bollix up existing clients than to do anything really useful. It's still
a possible future direction, though.

Modified Files:
--------------
pgsql-server/doc/src/sgml/ref:
grant.sgml (r1.39 -> r1.40)
(http://developer.postgresql.org/cvsweb.cgi/pgsql-server/doc/src/sgml/ref/grant.sgml.diff?r1=1.39&r2=1.40)
revoke.sgml (r1.29 -> r1.30)
(http://developer.postgresql.org/cvsweb.cgi/pgsql-server/doc/src/sgml/ref/revoke.sgml.diff?r1=1.29&r2=1.30)
pgsql-server/src/backend/catalog:
aclchk.c (r1.102 -> r1.103)
(http://developer.postgresql.org/cvsweb.cgi/pgsql-server/src/backend/catalog/aclchk.c.diff?r1=1.102&r2=1.103)
pgsql-server/src/backend/utils/adt:
acl.c (r1.104 -> r1.105)
(http://developer.postgresql.org/cvsweb.cgi/pgsql-server/src/backend/utils/adt/acl.c.diff?r1=1.104&r2=1.105)
pgsql-server/src/include/utils:
acl.h (r1.69 -> r1.70)
(http://developer.postgresql.org/cvsweb.cgi/pgsql-server/src/include/utils/acl.h.diff?r1=1.69&r2=1.70)
errcodes.h (r1.11 -> r1.12)
(http://developer.postgresql.org/cvsweb.cgi/pgsql-server/src/include/utils/errcodes.h.diff?r1=1.11&r2=1.12)
pgsql-server/src/test/regress/expected:
privileges.out (r1.26 -> r1.27)
(http://developer.postgresql.org/cvsweb.cgi/pgsql-server/src/test/regress/expected/privileges.out.diff?r1=1.26&r2=1.27)