* 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
Adds four basic logging functions to Chem that log through the C++
logging mechanism:
Chem.LogWarningMsg(msg)
Chem.LogInfoMsg(msg)
Chem.LogErrorMsg(msg)
Chem.LogDebugMsg(msg)
And a Wrapper to enable logs to be mirrored in Python SysStderr. One of
the nicer features of this logging system, is that Threaded logging is
synchronized to Python where it is interleaved in raw C++ logging.
Chem.WrapLogs()
