Add psycopg2 as dependency in setup.py.
Add progress/model package.
Move and rename models.py to model/meta.py.
Tidy up meta.py and add __all__ for module.
Add progress/model/domain_objects package.
Update .ini files to use Postgresql databases.
Move setup of db engine and binds into function called from main.
Update Base and DBSession imports in initializedb script.
Use dotted Python names instead of import.