Remove 'native data' and 'native units' (#331)

Resolves #331 (closed)

Somehow resolves #850 (closed)

GUI/Model/Job/JobItem.cpp

@@ -362,7 +362,8 @@ void JobItem::adjustReaDataToJobInstrument()
     if (instrumentItem()->is<GISASInstrumentItem>()) {
         // Temporary conversion of real units to degrees before copying masks to instrument.
         // It is not clear why we need to do this ... and whether it still works
-        const auto frame = instrumentItem()->makeFrame();
+        // TODO: unravel which operation were used here and restore them if necessary
+        // const auto frame = instrumentItem()->makeFrame();
 
         importMasksFromDatafileItem(); // Copy masks and ROI from DatafileItem on board of
                                        // instrument.