Provide information about dark-corrected flats

[mgalloy]

We would like to have dark-corrected flats easily accessible for analysis, particularly the median of the dark-corrected flats.

Questions

• Should I store the dark-corrected flats in the YYYYMMDD.ucomp.WWWW.flat.fts file? or should I write another file that stores the dark-corrected flats, say YYYYMMDD.ucomp.WWWW.dark-corrected-flat.fts?
• Are flat_rcam_median_linecenter, flat_rcam_median_continuum, flat_tcam_median_linecenter, and flat_tcam_median_continuum sufficient? or do we need for each wavelength, i.e., not just line center?

Tasks

• [ ] store the dark-corrected flats in a FITS file
• [ ] store the median of the dark-corrected flat used for each science FILE in the database

[detoma]

We probably want to do some masking to remove the corner of the flat images before computing the median.