distribute the bison/flex output as configure files (fixes issue #33)
Merge branch 'master' into issue33
Merge branch 'master' into issue33
use ADD_FLEX_BISON_DEPENDENCY only when both bison and flex are available.
Fixes #48
Merge pull request #49 from nhfechner/master

PandasTools compatibility patch for pandas version 0.11.0
Fixes #50
Merge branch 'master' of https://github.com/rdkit/rdkit
cleanup includes
Fixed error occuring when pandas is not installed