Updated sev initialization

Modified CLASS_settings to check if loaded parameters file has all of
the required fields and sets the default values in the event any are
missing.
updated batch_run.m to reflect .edf_folder field of SETTINGS.BATCH_PROCESS
Update error detection of batch_run
Generalized CLASS_settings saveParametersToFile

Can now leave dataStruct2Save parameter empty and current held settings
will be saved to disk.