* first pass at allowing Hs to be ignored in getBestRMS()
* add support in getAllConformersBestRMS()
* do getBestAlignmentTransform()
* cleanup, error checking, and a fix
* this is more painful than it seems like it should be
* add python wrappers and tests
* response to review
* first pass at multithreaded getBestRMS
* add that to the python wrappers
* add getAllConformerBestRMS()
* more testing
* doc strings
* add forgotten test file
* change in response to review
fix the dumb logic error in thread count determination
* update the tests for the new catch