initial revision of plotcsv, processing RASDRviewer_W_1_0_4 FFTOut.csv files
update for RASDRviewer 1.0.5
refactored to handle datetime as core instead of excel-datetime; allow array or line processing; add logging module; add background subtraction capability
plotcsv program to go with RASDRviewer 1.0.5.x
Source document from Zydrunas