* remove all of the "from __future__" imports
* remove the first batch of rdkit.six imports/uses
* next step of rdkit.six removal
* removing xrange, range, and some maps
* next round of removals
* next round of cleanups
* fix inchi test
* last bits of "from rdkit.six" are gone
* and the last of the six stuff is gone
* strange importlib problem
- fixed dependency from ordering of dict keys in a doctest
- replaced import of cPickle from the python2 lib w/ rdkit.six.moves.cPickle
- fixed a few more tests
- support pickle load/loads kw arguments with a portable interface
