v0.7.3

Changed

• io.xtandem: Parse double mass modifications as double modification instead of merging and summing mass shifts into a single modification.
• io.xtandem: Avoid float formatting issues when parsing modification mass label.
• io.xtandem: Parse all proteins into protein_list instead of only the first one.
• io.tsv: Log error instead of raising exception when a TSV row cannot be parsed.

Full Changelog: v0.7.2...v0.7.3