Start splash2xdmf python script

 - currently only fields
Add newline at eof
Properly parse cmd line and set script type
Sort splash grids as attrs in matching xdmf grids

 - fix main
 - strip start of attribute names
Support time-series detection and output filename
Prepare for external usage
Merge pull request #96 from ComputationalRadiationPhysics/topic-h5py

Topic h5py