Mv db.sql.base to db.base

This concludes the db.sql.* -> db.* move. Our db abstraction layer is
sqlalchemy, so there is no need to a separate db.sql.* hierarchy.

All tests have been run for each of the commit series to make sure
everything works at every step.

mediagoblin/media_types/ascii/models.py

@@ -15,7 +15,7 @@
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
 
-from mediagoblin.db.sql.base import Base
+from mediagoblin.db.base import Base
 
 from sqlalchemy import (
     Column, Integer, ForeignKey)

mediagoblin/media_types/audio/models.py

@@ -15,7 +15,7 @@
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
 
-from mediagoblin.db.sql.base import Base
+from mediagoblin.db.base import Base
 
 from sqlalchemy import (
     Column, Integer, ForeignKey)

mediagoblin/media_types/image/models.py

@@ -15,7 +15,7 @@
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
 
-from mediagoblin.db.sql.base import Base
+from mediagoblin.db.base import Base
 
 from sqlalchemy import (
     Column, Integer, Float, ForeignKey)

mediagoblin/media_types/video/models.py

@@ -15,7 +15,7 @@
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
 
-from mediagoblin.db.sql.base import Base
+from mediagoblin.db.base import Base
 
 from sqlalchemy import (
     Column, Integer, SmallInteger, ForeignKey)