insulate against gtk initialization failures
Merge branch 'master' of https://github.com/rdkit/rdkit
- fixed a bug in the MMFF stretch-bend gradient calculation
- put in better evidence the extents of the UFF hack so that it can be
  easily commented out if required
Merge pull request #126 from ptosco/master

Critical bug fix in the MMFF stretch-bend gradient calculation
remove USR references from SWIG wrappers
changes suggested by Roger S:
add residueNumber
serialNumber -> int
add segmentNumber
a couple of small vector modifications
add a couple new descriptors
PandasTools: Improved exception handling during initialization (FIX Issue 123)
Merge pull request #129 from nhfechner/upstream

PandasTools: Improved exception handling during initialization
merge an O3A patch from Paolo T.
fix a bunch of include guards
mmff into SWIG wrapper. first tests
note: these changes remove some direct ff-manipulation functionality that was
present previously
add basic support for O3A to Java wrapper
Fixes #130