make-mask is called by cheese to create a cheese mask from the filtered source list.
Warning and requirements: make_mask is part of the esas package integrated into SAS, but it is limited to work within the esas data reduction scheme. This is specially true wrt the structure and bames of the input files. In particular, make_mask assumes that another task from the package, mos-filter / pn-filter, has been successfully run for the exposure to be used.
