* Wrap Chem.FindPotentialStereoBonds into Python.
* findPotentialStereoBonds now sets the Bond.GetStereo property of the double bond to Bond::STEREOANY.
Some of the doc strings indicated this as the desired behavior, but
some others also indicated otherwise. So I've cleaned up and
refactored those doc strings as well to be consistent. Pulled all the
doc string comments from the .cpp file up to the .h file and merged
all the necessary prose, including adding some about the fact rings
are ignored.
Previously, users would have to test the size of the GetStereoAtoms
vector to determine whether this function found potential double bond
stereo. Testing for Bond::STEREOANY instead is way more straight
forward.
