Pdb-prot-align

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Added
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* Added ``--drop_refseq`` argument.

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Added
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* Can pass arbitrary command-line arguments to ``mafft``.

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Added
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* ``genbank`` module.

* added ``returnval`` to ``nglview_struct.render_html``

Fixed
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* Fixed bug when PDB has insertions relative to reference sequence.

* Fixed bug if floats in residue number column for coloring structures.

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Added
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* ``remove_widget_view`` option to ``nglview_struct.render_html`` to enable embedding of structure widgets in HTML without showing them twice.

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Added
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* Can handle multiple distinct non-overlapping chains; adds a ``pdb_chain`` column to output CSV.

* Changed output to specify a prefix rather than individual ``--alignment`` and ``--csv`` options.

* Added ``add_entropy_neff`` option to ``alignment_to_count_df``

* Added the ``colorschemes`` module.

* Added ``pymol_struct`` module to color ``pymol`` structures.

* Added ``nglview_struct`` module to color ``nglview`` structures.

Fixed
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* Made ``--drop_pdb`` and ``--ignore_gaps`` options work correctly (before they did nothing due to command-line parsing error)

* Allow ``pandas`` >= 1.0

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Added
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* ``main.py`` will create the output directory(ies) if they do not exist