Fix bug in collision detection

[Richèl Bilderbeek]

Currently, health and diameter are the same thing, just on different scales (to be precise: diameter == 100.0 * health).

However, when this was implemented, some collision tests failed. These were commented out by FIX_ISSUE_732.

Make those tests work again :-)

[Oscar]

732 has nothing to do with get_diameter or health?

[Claudio Tiecher]

This issue is indirectly related to changes in get_diameter (<- which return m_health multiplied by a constant factor). Should we change the way game object is constructed? Should be players be spaced correctly inside game constructor?

[Luxwor]

there seams to be an issue but the test doesn't fail when I run it