Use Yb psp.
Revert the change tot he Yb psp.
Detailed additional doc on new input sets added to pymatgen.
Change Yb psp.
Move filelock to io_utils.
Remove defunct io_abc and move filelock test to io_utils.
Fix doc for POTCAR.
Make docstring clearer.
add option to use MIT vasp input set in matgenie.py.
Very minor cleanup.
update OrderDisorderedStructureTransformation to allow grouping by symmetry for
symmetrized input structures
Merge branch 'master' of github.com:materialsproject/pymatgen
make sure we use a small SIGMA when setting ISMEAR=0 for uniform kpoint grid nsc computations
Simplify many Exception classes.
Merge branch 'master' of github.com:materialsproject/pymatgen
Remove obselete todo.
Add DiffusionAnalyzer.
Merge remote-tracking branch 'mpmaster/master'

Conflicts:
	pymatgen/util/testing.py