Modified readOpenArray:
-- now only works with the csv file exported by the LifeTech OpenArray software
-- in the future there will be different functions for other input file formats
-- rather than assume a fixed starting line for the data, scan the first 50 lines for "Experiment Name"
-- remove only the final character from the Sample.Name field to be the Feature.Set
-- the remaining part of the Sample.Name field is the Sample.Id
processQPCR now returns a qPCRset object