Clean up oxide_type
Fixed minor bug which over-stabilized oxy-hydroxides.
add find_spacegroup option to CIFWriter
add test for structure sorting
fix MAJOR bug in vaspio where POSCAR is unsorted and POTCAR is sorted
add test for correct POTCAR ordering
v2.8.6 release.
Changelog.
 Workaround in PseudoParser: the NLCC record seems to be optional in the Fhi format.
Merge remote-tracking branch 'mpmaster/master'
 prototypes for new Task subclasses
 Replace lists with generators
 Add new module for AbinitFlows
Merge branch 'master' of https://github.com/gmatteo/pymatgen

Conflicts:
	pymatgen/io/abinitio/workflows.py