aclitem out/in don't "work"

Just noting what seems to me to be a bug, though perhaps not a consequential
one since we never dump out the contents of system tables and don't expect
people to be using aclitem for non-system tables.

The output of aclitem can't be read back back in as an aclitem:

postgres=# select relacl::text from pg_class limit 1;
relacl
------------
{=r/stark}
(1 row)

postgres=# select relacl::text::aclitem from pg_class limit 1;
ERROR: unrecognized key word: ""
HINT: ACL key word must be "group" or "user".

I can't look at fixing it right now but I'll poke my nose in a bit later when
I'm done what I'm doing.

--
Gregory Stark
EnterpriseDB http://www.enterprisedb.com
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