further streamlined RedundantCalibrator and added get_omnichisq/omnigain/omnifit functions. test passes but the new get_omniX functions are not tested. In process of upgrading PSA64
added the calling of get_omniXX to unit tests and fixed related bugs, but the new get_omniXX functions' actual return values are not tested
added get_calibrated_data() and finished streamlining PSA64 (without testing)