small MMFF memory leaks plugged
Part of #159
O3A memory leak plugged
Part of #159
Test multi-thread safety for UFF and MMFF94. Both pass
Fixes #160
Test O3A thread safety (it passes);
Fixes #161
switch around library order to better support static linkage
Fixes #166
Fixes #167
I am not completely comfortable with the fact that one reference energy in testDistGeom.py
  had to be changed. This is worth looking into some more
remove extraneous printing
merge trunk
Fixes #162
Merge branch 'master' of github.com:rdkit/rdkit
get the mplcanvas working even if the renderer cannot be retrieved
Fixes #169
Note: it's probably worth revisiting all of these at some point.
Merge branch 'master' of github.com:rdkit/rdkit
initial pass at ZBO support.
does not yet handle the HYD and ZCH lines
stop messing up aromaticity and hybridization;
all tests pass, but this is definitely not the most efficient thing.
Fixes #170
add locale lock to mol2 and tdt parsers as well
remove some extraneous checks
add MolOps::get3DDistanceMat()