Also started using unittest assert functions
Finished skeleton code for NonPlanarOutlierFilter
This involved several things:

1. Finishing the linear fitting functions (probably won't need line fits but it was a copy and paste from the ptranc code I wrote last July
2. Finished testing for linear fitting
3. Updated all the tests to use if __name__ == '__main__': unittest.main()
4. Writing the bare bones implementation of my NonPlanarOutlierFilter by using the plane fit.