[FEATURE] added option to PPHiRes to specify which ms levels should be picked
[TEST] added test for selecting spec levels when picking
[PARAM,TOPP] removed ms1_only parameter and replaced with ms_levels
[DOC] documented param change in changelog
[NOP] fixed cppcheck performance warnings
Merge pull request #977 from aiche/feature/pphires-customizable-mslevels

[FEATURE] replaced pphires ms1_only flag with ms_levels parameter