New way to merge multi-EPSG mosaics: take values that correspond to the maximum count0 overall
sensor_flag attribute, encoding changes: reverse 0s and 1s
Add command-line option to use valid v[xy]_error_slow in place of v[xy]_error values when creating composites (used to create RGI05A and RGI19A mosaics)
Rename datacubes to be consistent with composites naming convention: issue #21
Scripts to restore M11, M12 in S1 granules, datacubes
Various fixes as we started building v2 mosaics: