Revision 1585

Move some of the mock objects in test_baserenderer into their own
module so they can easily be used from other tests

* test/mockgeo.py: New test helper module with some mock objects
for geometry related things like shapes, shapestores and
projections.

* test/test_mockgeo.py: New. Tests for the new helper module

* test/test_baserenderer.py: Some of the mock-objects are in mockgeo now.