add unit test testRDKitMolAtomMapping in moleculeTest
add unit test testRDKitMolAtomMapping in moleculeTest

nickvandewiele/RMG-Py,pierrelb/RMG-Py,chatelak/RMG-Py,nyee/RMG-Py,nyee/RMG-Py,pierrelb/RMG-Py,chatelak/RMG-Py,nickvandewiele/RMG-Py