components.CoReg.imParams:
- r_b4match' and 's_b4match' are now internally handled as band indices rather than band numbers

components.CoReg._local.COREG_LOCAL:
- removed attributes r_b4match and s_b4match (confusing duplicates of COREG_LOCAL.imref.r_b4match

components.Geom_Quality_Grid.Geom_Quality_Grid:
- r_b4match' and 's_b4match' are now internally handled as band indices rather than band numbers

components.geometry:
- get_true_corner_mapXY(): added docstring, refactored keyword 'bandNr' to 'band' -> now handled as index