v1.27.0.1

-- Fix error when data storage scheme is 'files' (instead of 'memory') private non-SNIRF spec variables are being accessed illegally. Need to use FileLoadSaveClass methods. Part of last commit to make non-SNIRF spec variables private.
-- Add to DataTreeClass the method AutoSetDataStorageSchemesimple to determine data storage scheme automatically from the data groupResults.mat (rather than hard-coding it from AppSettings.cfg. This probably could be improved but it's a start.