Change default Postgres from 9.0.3 to 9.2.4.  Besides being the
latest, this also includes some security patches (see their web site)

I'm currently testing with the various Postgres versions that include
their security fixes, 9.2.4, 9.1.9, 9.0.13, and 8.4.17, and will post
to iRODS chat about this shortly.  So far I've confirmed that iRODS
works fine with 9.2.4 and 9.1.9.



git-svn-id: svn://irodssvn.ucsd.edu/trunk@5431 ea137bd6-aa86-47b6-b90d-b101d9f19a90