improved creation of merged quantification tables

at the moment it expects peptide quantification samples, though
create.meta.reports now works more like create. reports and allows ... arguments
uses not.localized tables
modified spectrumSel to work with a matrix argument with arbitrary columns (which appear in fData)
added 'round.to.frac' argument to convertPhosphoRSPepProb

round.to.frac=2 rounds to the nearest 0.5; round.to.frac=20 rounds to the nearest 0.05, etc
added peptideRatiosNotQuant as convenience function to quantify peptides which were not used for quantification (due to unsure localization) in the first run
added calculation and XLS tab for peptides with unsure localization
updated isobar-import