use declarative_base for all ORM models

This rewrites the entire model base as declarative models.
This allows us to more easily customize overlay fields
in tables and is more common.

This effort also brought some DB violations to light which
this commit addresses.

Signed-off-by: Kevin Morris <kevr@0cost.org>

test/test_package_group.py

@@ -25,7 +25,7 @@ def setup():
                          AccountType.AccountType == "User").first()
     user = create(User, Username="test", Email="test@example.org",
                   RealName="Test User", Passwd="testPassword",
-                  account_type=account_type)
+                  AccountType=account_type)
 
     group = create(Group, Name="Test Group")
     pkgbase = create(PackageBase, Name="test-package", Maintainer=user)