While running a test case I had written to pursue problems with

  llDie() not always completely working, I discovered I was
  getting a lot (60+ over 6000 iterations of the test case)
  null pointer exceptions in various physics related checks in
  SceneObjectPart. It was apparent that the (frequent) checks for
  PhysActor being non-null is an insufficient protection in a
  highly asynchronous environment. The null reference exceptions
  are one example of failure, but it could also happen that a
  sequence started with one instance of a PhysicsActor might
  finish with another?
  Anyway, I have implemented a safer mechanism that should
  stop the errors. I re-ran my test case with the fix in place,
  and completed nearly 1000 iterations without a single occurrence.

  SceneObjectPart is seriously in need of rejigging, if not for
  this reason, then for its ridiculous size.

Signed-off-by: dr scofield (aka dirk husemann) <drscofield@xyzzyxyzzy.net>

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