Taranushi

• Fixed coadded metadata
• fixed Healpix path (healpixgrp) columns to use integer healpix group values
• Added fits columns descriptions to fits headers
• Fixed SDSS_id bug in SDSSV plates
• added targeting flags
• fixed SDSSV plate (field) epoch coadds bug
  • only coadd a single plugging
• streamlined running of full pipeline catchup runs
• added model column back to specfull and speclite files
• added observatory specific custom coadds
• added code to update targeting flags within the spAll files