moved 5.2.0 version of dtopotools.py to dtopotools_5_2_0.py: keep around for a while for backward compatibility
moved dtopotools2.py to dtopotools.py since this now has sufficient functionality.
changed SubFault.geometry to @property so set_geometry is only called once when needed
cleaned up commented out calls to set_geometry
added tests/test_dtopotools.py with one unit test
modified DTopography.animate_dz_colors to use JSAnimation for notebook or html file.  Needs clawpack/visclaw#114 to function