prepOrbidata.R "basic user editing" as command line arguments

[lee-t]

Might be useful to have a way for some things like directory be passed as arguments. IPO parameters could be parsed from a list or even a txt file

[jamesrco]

There's a small (perhaps useless?) starting point for this in lines 352-373 (output) and 408-416 (for reading back in) in current version: https://github.com/vanmooylipidomics/LipidomicsToolbox/blob/master/prepOrbidata.R