Removed a dependency the Physics Work unit had, where it assumed that the entresol would be available.
Cleaned up physics crash
Merge branch 'master' of github.com:BlackToppStudios/Mezzanine
Added [(slows), ](speeds up) and \'restores' orginal simulation spedd
fixed physics crashtest and the detection of grapics shutdown assert.
Removed Duplicate code in physics workunits