components.CoReg.COREG:
- added _handle_error()
- changed error handling

components.CoReg_local.COREG_LOCAL:
- __init__(): fix for bad error message

components.Geom_Quality_Grid.Tie_Point_Refiner:
- __init__(): RANSAC is not not run if there are less than 4 tie points available
- _RANSAC_outlier_detection(): revised assertion

- updated __version__