Remove unneeded package includes.

Conflicts:
	opengever/ogds/base/configure.zcml
Move filing testing helpers to opengever.core.testing.

Conflicts:
	opengever/advancedsearch/tests/test_search.py
	opengever/core/testing.py
Cleanup configuration file.

Conflicts:
	opengever/dossier/configure.zcml
Improve naming.