[FORMAT,DOC] enabled mzid input, improved documentation
[INTERNAL] conversion from mzid: warn before converting; removed unnecessary 'std::' qualifiers
[FIX] fixed grammar of warning message
[FIX] fixed indentation of XML output
[FIX] fixed spelling of warning message
[FIX] fixed error/warning messages; removed unnecessary 'std::' qualifiers
[TEST] added tests for IDFileConverter mzid <-> idXML conversions
Merge pull request #1090 from hendrikweisser/fix-idfileconverter-mzid

Enable mzIdentML input in IDFileConverter