fix segmention faults by PROTECTing duplicate call
implement simple offset/scaling intensity calibration (TIC, Median; #31)
approxfun returns NA for empty MassSpectrum objects
simplify .mergeMassSpectra (adapt to new approxfun)
use a really empty spectrum
first PQN approach (empty spectra are not supported)
add mergeMetaData argument
shortening method names
add tests for calibrateIntensity
add manual pages for calibrateIntensity
export calibrateIntensity
add TIC calibration to workflow demo
mark as deprecated: calibrate, standardizeTotalIonCurrent, totalIonCurrent<-
bump version number (calibrateIntensity added; closes #31)
replace standardizeTotalIonCurrent by calibrateIntensity