[PATCH] Improve autocompletion for SELECT statements

Hello,

A big part of my job is creating simple select statements with a few joins
in them. Unfortunately, the existing autocomplete functionality of pgadmin
was a bit too limited for my use case. A relatively simple query like:
select * from person p join company c on p.company_id = c.id where p.name =
'John' would be enough to completely throw the autocompletion off.

So I started working on a patch to improve the autocompletion a bit and the
result is attached. It doesn't have all the features I would like it to
have (no support for table aliases, for example) but it is already a big
improvement for my use case.

Please comment if I need to change anything to get this patch into pgadmin.

This patch is against pgadmin3-1.14.0.tar.gz

Regards,
Wander Winkelhorst.