add ignore_cosmic_ccdmask option, use maskbits, do not dilate cosmic ray mask
add ignore_cosmic_ccdmask option, use maskbits, do not dilate cosmic ray mask

gdhungana/desispec,timahutchinson/desispec,desihub/desispec,timahutchinson/desispec,desihub/desispec,gdhungana/desispec