Yet More Blobs (PostgreSQL)

I've now added Blob support for BaH.DBPostgreSQL.

I also noticed an issue with retrieving doubles/floats from the database, which I've also fixed.

Adding Blob support required a bit of hacking around of the core functions, so I hope I've not broken anything important.

David, have you got any regression tests you can run? :-)

Passes all tests with flying colours thanks Brucey :-) No wobbles, no leaks. Mind you I haven't tested the Blob code specifically - I just built against my existing code.

Thats great news! Will the blob support come to the other databases too? Im just wondering if I should change from sqlite to postgresql.