change ISMEAR for HSE computations to 0 (as recommended by VASP)
add a way to detect converged DFPT (LEPSILON=True) runs
update GrandPotentialPhaseDiagram constructor to allow several elements to be open
Merge branch 'master' of github.com:materialsproject/pymatgen

Conflicts:
	pymatgen/io/MPHSEVaspInputSet.json