. Make the AnimationFrames GUI control work on Windows and FreeBSD.

  . Make animated moves work in HyperViewer on FreeBSD.

    - Add setFrameEndCB to HypView{,er}.{h,cpp}, frameEndCB to hvmain.cpp .

    - Pass the wxGLCanvas pointer from the Python app all the way down to
      frameEndCB to call wxGLCanvas->SwapBuffers().
      The pointer comes through "encrypted" from Python, hack around that.

    - hvMain now needs to be compiled and linked against the
      wx_gtk2-2.4 includes and libs so it can call SwapBuffers.