Minor renaming into include '_px' post-fix.
Added translateZoom function.

- Also renamed MapAdapter zoom member variables to make it clear that
the controller zoom does not directly relate to each adapter zoom.
Initial trial with Projection SphericalMercator.
Disable the mc2 example for now.
Added a method to fetch the tile size in Projection.
Renamed zoom functions.
Renamed Projection to ProjectionInterface.
Added projection get/set methods.
Started migration of controller zoom to MapControl.
Migrated pixel/coord conversion from MapAdapter to Projection.
Added create instance function to Image Manager.
Continued migration of zoom controller from MapAdapter to MapControl.
Extended Projection to provide it EPSG number.
Added offset and inverted y-axis support

- Fixes previous yahoo workarounds.