[1.0.X] Fixed #10071 -- Changed some internal database data representations.

We now pass numbers used in data queries as actualy numbers (integers) to the
database backends, rather than string forms. This is easier for some of the
less flexible backeds.

Patch from Leo Soto.

Backport of r10530 from trunk.

git-svn-id: http://code.djangoproject.com/svn/django/branches/releases/1.0.X@10531 bcc190cf-cafb-0310-a4f2-bffc1f526a37