* Adds useChirality to replaceCore, fixes atom ordering
n.b. when replaceDummies==False and labelByIndex==True
the indices used are the indices of the dummy atom,
previously they were the atoms the dummy was connected
to.
* Adds useChirality to the remaining functions in ChemTransforms
* Adds a mess o tests
* Fixes labelByIndex=false ordering for dummies
* Removes debugging statements