import mzID
add utils.{vec2ssv,ssv2vec,list2ssv,ssv2list} helper functions
add utils.mergeSpectraAndIdentificationData
add identificationFiles slot for MSnProcess
Revert "add identificationFiles slot for MSnProcess"

This reverts commit 951606bc4a14a6f3c4b82a2d24d9122f4495f86a.
add fileNames<- for MSnProcess, MSnSet, pSet (not exported)
fix test of multiple files
allow different number of files in assayData/featureData and the files slot
store fileId in featureData
add utils.leftJoin to replace base::merge
replace merge by utils.leftJoin in utils.mergeSpectraAndIdentificationData and extend test case
Merge branch 'master' into addIdentificationData

Conflicts:
	NEWS
move test_utils.R to new destination: test/testthat/
reintroduce NEWS entry 1.11.7
correct mzID version dependency
add utils.addSingleIdentificationDataFile and utils.addIdentificationData
use fileId instead of filename for merging
add addIdentificationData,{MSnExp,MSnSet}-method
Merge branch 'master' into addIdentificationData
add fData call