Potential memory leak

[Samir Menon]

In muscle code SChaiGraphics.cpp :

Also, chai is now bsd. So can avoid some cruft from when it was GPL and we wanted to potentially avoid linking with it.

      ~SGraphicsMusclePoint()
      {//NOTE TODO : Possible memory leak.
        // if(S_NULL!=pos_) { delete pos_;  }
      }