components.CoReg.COREG:
- added _validate_ssim_improvement() - not yet working
- _get_image_windows_to_match(): bugfix for using wrong bands

components.CoReg_local.COREG_LOCAL:
- view_CoRegPoints(): now used the correct band of the background image

components.DeShifter.DESHIFTER:
- revised __init__()
- correct_shifts(): revised condition for diciding if warping is needed

components.Geom_Quality_Grid.Geom_Quality_Grid:
- _get_spatial_shifts(): bugfix for returning match win size XY vice versa