I made changes to the back_postgresql.py to handle
using psycopg2 instead of psycopg.  There weren't that
many changes so I'm not sure if a seperate module would
be necessary or not.  I am including the diff file that
shows the differences between the original
back_postgresql.py and my modified one.

My email is David.Byrne@cambridge-na.com

Thanks,
David Byrne