Feature/pep evidences df

[axelwalter]

Description

Added the export of peptide evidences for the best peptide hit in peptide_identifications_to_df(). New columns for accession, start and end position of peptide evidences. They are comma separated similar to mzTab.

Checklist:

• Make sure that you are listed in the AUTHORS file
• Add relevant changes and new features to the CHANGELOG file
• I have commented my code, particularly in hard-to-understand areas
• New and existing unit tests pass locally with my changes
• Updated or added python bindings for changed or new classes. (Tick if no updates were necessary.)

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[timosachsenberg]

Thanks! looks good. I think we can now think about an extension to the readthedocs page how to use the dfs