Galore

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- BUGFIX: PDOS plot was failing for elemental systems

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- Matplotlib styling is exposed to the user: ``--style`` option selects CLI style
while Python API does not overrule existing style.
- The default TDOS line colour is now the first colour from the
selected style, which is usually blue. The previous default was a
bright red.
- Pymatgen CompleteDos objects can be processed directly.
- Dropped Python 2.7 compatability.
- Fixed PDOS bug introduced with Python3 cleanup

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- galore-plot-sc can optionally show values in Megabarn/electron

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- Resample with interpolation by default; use "spikes" only when requested

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- Import (P)DOS from ``.gpw`` files generated with GPAW. This requires GPAW to be available.
- galore-plot-sc tool for convenient plotting of cross-section data

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- BUGFIX: Yeh/Lindau weightings for partially-occupied orbitals
- BUGFIX: Odd behaviour in s orbitals including one transcription error
- Expanded weighting features: HAXPES data parametrised from Scofield tables
- Verbose output including cross sections, warnings and data source citations
- galore-get-sc tool for direct access to cross-section data
- Change Yeh labels from 'xps', 'ups', 'haxpes' to 'alka', 'he2', 'yeh_haxpes'