Reconcile github and psi4 flavors of qcdb. Incorporate psi4 license and PsiMod --> psi4 switch. Incorporate many of the libmints Molecule changes since Aug 2012 but not all, particularly excluding dropping the tracking of dummy atoms. molecule methods BFS and grimme dftd3 also not reconciled, the qcdb versions being behind in the latter since will need to refactor files.