moved map_bcd_sources to bcd_list.py, deleted bcd_sources.py, changed ok_bitflags to [0] (meaning bcd_phot.pro will not ignore any bitflags when called with /mask, added the capability to pre-initialize an output dir with bcd_dict.json, unc_dict.json, and bcd_list.json/source_list.json in subdirs 1, 2 - this makes it possible to skip the costly task of running get_bcd_list and map_bcd_sources