Show tablespace for databases with psql's \l+

Following discussion
(http://archives.postgresql.org/pgsql-hackers/2006-03/msg01208.php) here's a
patch to add tablespace to the output of psql's \l+. New output (with psql
-E) looks like this:

pyarra=# \l+
********* QUERY **********
SELECT d.datname as "Name",
r.rolname as "Owner",
pg_catalog.pg_encoding_to_char(d.encoding) as "Encoding",
pg_catalog.shobj_description(d.oid, 'pg_database') as "Description",
t.spcname as "Tablespace"
FROM pg_catalog.pg_database d
JOIN pg_catalog.pg_roles r ON d.datdba = r.oid
JOIN pg_catalog.pg_tablespace t on d.dattablespace = t.oid
ORDER BY 1;
**************************

List of databases
Name | Owner | Encoding | Description | Tablespace
-----------+--------+----------+---------------------------+------------
postgres | pyarra | LATIN1 | | pg_default
pyarra | pyarra | LATIN1 | | pg_default
spctest | pyarra | LATIN1 | | spctable
template0 | pyarra | LATIN1 | | pg_default
template1 | pyarra | LATIN1 | Default template database | pg_default
(5 rows)

Please let me know if this patch needs any changes for acceptance. I would
prefer the tablespace row to the left of Description, but opted for minimal
change to get patch accepted. Will re-order them if others are in favour.

Regards, Philip.

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Utiba Pty Ltd
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