pgsql: Update tablespace temp usage item: < This perhaps should use a

Log Message:
-----------
Update tablespace temp usage item:

< This perhaps should use a round-robin allocation system where several
< tablespaces are used in a cycle. The cycle pointer should be global.

It could start with a random tablespace from a supplied list and cycle
through the list.

Modified Files:
--------------
pgsql/doc:
TODO (r1.1374 -> r1.1375)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/TODO.diff?r1=1.1374&amp;r2=1.1375)