moving histogram equalization functions to their own module
the histogram functions moved to a different module, so change the import
updating some parameters for histogram equalization and how they're used
adding code to load and process the moon illumiation and angle as well as lon/lat information and the water mask; all of this is used in the new calls to the DNB scaling
adding in code to load the lunar zenith angle and moon illumination fraction
adding moon information into the meta data; adding moon info and lat/lon filepaths to the dnb scaling call
removing the land-water mask for now
changing meaning of the --new-dnb command line argument to cause it to create another product instead of replacing the existing DNB product
changing product numbers and output file names for new version of DNB output
Merge branch 'dnb_adapt'