The DrawDebugData command needs a boolean parameter for clearing the screen.  
Currently, any call to DrawDebugData will wipe the screen clear of anything 
that was drawn in mojo for example.  By giving the option not to clear, the 
debugdata can be drawn over top of your graphics with alpha for precise 
debugging. Further - the new parameter can have a default of false so that 
other user's current code works the same with no modification. I modify the 
module to do this myself, but thought I would report it here as it would likely 
be useful for others as well.


Code shange is minimal:
b2world.monkey @1498
Method DrawDebugData : Void (doCLS=false)
  if (m_debugDraw = Null)
    Return
  End
  if (doCLS)  
    m_debugDraw.Clear()
  End
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