Bugfix MSFraggerAdapter

[tillenglert]

Description

Changed the deprecated parameter max_variable_mods_per_mod to the one used by MSFragger: max_variable_mods_per_peptide

Added the option 0/1/2 to isotope error (also as defined in MSFragger)

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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Advanced commands (admins / reviewer only):

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• /reformat (experimental) applies the clang-format style changes as additional commit
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[jpfeuffer]

Thanks