[development] PostgreSQL support for 4.8 install system

[Sammy Spets]

Hi everyone,

I've added pgsql support in the install system. I've added a few bells
and whistles too. Most notably we now have unsigned smallint, int and
bigint added in! Those become smalluint, uint and biguint. Check out
http://drupal.org/node/76681 for install.pgsql.inc and the patch needed
for system.install. I'm in need of testers to ensure the install system
operates properly.

Cheers,

-- 
Sammy Spets
Synerger Pty Ltd
http://www.synerger.com/