Add functions:
    Bool_t IsBoxOrientationConsistentXx();
    void   CheckAndFixBoxOrientationXx();
  that check and fix box orientation so that the face normals point
  outwards.

* TEveBox, TEveBoxSet:
  Ensure proper box orientation.


git-svn-id: http://root.cern.ch/svn/root/trunk@37228 27541ba8-7e3a-0410-8455-c3a389f83636