remove IdentSpectrum* and QuantFragment* fields
replace loadFragmentsCsvFiles/loadSpectrumXmlFiles by loadIdentificationFragments/loadQuantitationSpectra
reduce crossMatching to ident fragments vs quant spectra
adapt plotCrossMatching to reduce CrossMatching
adapt plotCrossMatchingPerformance to reduced CrossMatching
adapt filter(Non)UniqueMatches to reduced CrossMatching
adapt plotCumulativeNumberOfFragments to reduced CrossMatching
adapt manual pages to reduced CrossMatching
adapt vignette to reduced CrossMatching
rename CrossMatching to FragmentMatching; closes #72
Merge branch 'issue72' into 2.0

Conflicts:
	NEWS