fixed "shadow local variable" warning
[FEATURE,API] extended IsobaricChannelInformation

 * switched from int to String for channel name for coming support of TMT 10plex
 * added specific isotope impurity definition -> each channel has to declare to which channels his -2,-1,+1,+2 isotopes will contribute
[FEATURE] added tmt10plex quantitation method
[FEATURE] added tmt10plex to IsobaricAnalyzer
[TEST] added an extra test for tmt10plex channel extraction, since some of the reporters are only 0.006 Th apart
[DOC] fixed copy/paste errors in documentation
[PYOPENMS] adapted pyopenms to tmt10plex related changes
[NOP] added explicit d'tor for IsobaricAnalyzer freeing the quant methods
[DOC,NOP] fixed some copy and paste errors
Merge pull request #965 from aiche/feature/tmt-10plex-support

[FEATURE] tmt 10plex support