* trying to add shape tversky
* alpha and beta no defaults, added more tverskyIndex tests to testGrid
* corrections to GridUtils.h and ShapeUtils.cpp
* corrections to GridUtils.h
- Remove a few confusing and unnecessary SD file handling functions from FileParsers (better functionality is available in the SDMolSupplier)
- Support not removing Hs in the Mol file handlers (C++ and Python)