COREG_LOCAL: target image is now warped prior to tie point grid computation -> saves 30-40% of total runtime

components.CoReg.COREG:
- added equalize_pixGrids()
- _get_image_windows_to_match(): warping is now only executed if pixel grids are really different

components.CoReg.COREG_LOCAL:
- __init__(): edited docstring

components.Geom_Quality_Grid.Geom_Quality_Grid:
- __init__(): edited docstring
- get_CoRegPoints_table(): included equalization of pixel grids prior to computation of tie point grid -> saves 30-40% of total runtime

- updated __version__