Add SaveFile method to the PyMol wrapper
Add SaveFile method to the PyMol wrapper

* Fixes #882
not yet tested on windows

* remove some complex code and switch to os.path.abspath

ptosco/rdkit,rdkit/rdkit,rdkit/rdkit,greglandrum/rdkit,adalke/rdkit,adalke/rdkit,adalke/rdkit,greglandrum/rdkit,bp-kelley/rdkit,greglandrum/rdkit,rvianello/rdkit,bp-kelley/rdkit,adalke/rdkit,greglandrum/rdkit,jandom/rdkit,adalke/rdkit,rvianello/rdkit,jandom/rdkit,adalke/rdkit,rdkit/rdkit,jandom/rdkit,adalke/rdkit,rdkit/rdkit,ptosco/rdkit,ptosco/rdkit,ptosco/rdkit,ptosco/rdkit,rvianello/rdkit,rvianello/rdkit,bp-kelley/rdkit,rdkit/rdkit,bp-kelley/rdkit,jandom/rdkit,bp-kelley/rdkit,ptosco/rdkit,bp-kelley/rdkit,bp-kelley/rdkit,jandom/rdkit,jandom/rdkit,ptosco/rdkit,rvianello/rdkit,greglandrum/rdkit,jandom/rdkit,rdkit/rdkit,rvianello/rdkit,bp-kelley/rdkit,greglandrum/rdkit,rdkit/rdkit,greglandrum/rdkit,adalke/rdkit,rvianello/rdkit,rdkit/rdkit,rvianello/rdkit,jandom/rdkit,greglandrum/rdkit,ptosco/rdkit