STY/MAINT: equilibrium: Rename grid_opts to calc_opts and document some new kwargs. Stub the output kwarg. Progress on gh-36.
STY/MAINT: equilibrium: Rename grid_opts to calc_opts and document some new kwargs. Stub the output kwarg. Progress on gh-36.

tkphd/pycalphad,tkphd/pycalphad,tkphd/pycalphad