Sumo

Bugfix: ``sumo-bandstats`` now reports the correct k-point indices for the VBM and CBM.

You can now specify custom colours for RGB mode projected band structures. See the
documentation for more details. The colormath package has been added as a dependency.

Major changes:

- DOS energies are no longer shifted by SIGMA in smeared calculations;
this will cause the DOS line to extend slightly beyond the VBM, but
will ensure peaks are in the right positions. (yw-fang & ajjackson)

New features:

- Fermi level may be chosen as energy zero in DOS or band structure (YWF, AJJ)
- Horizontal line may be requested at energy zero in DOS or band structure (YWF, AJJ)

Bugfixes

- VBM shift argument was not correctly passed in DOS plots (pzarabadip)
- Scissor option with combined band and DOS plot did not scissor DOS (utf)
- Spin option with combined band and DOS plot did not apply to the DOS (utf)
- Fixed phonon band structures with non-analytic correction (utf)

Bugfix: Fixed colour parsing for BS + DOS plots. (kavanse)

Bugfix: ``sumo-kgen`` with ``--hybrid`` but without ``--folders`` now asks whether to
split up the k-points.

Bugfix: Questaal band structure import was consistently raising unnecessary Exception