ocs: SC/21 more tweaking post workshop.

  * Expanded masking section
  * Expanded Skyloop section and added skyloop link
  * New MAKEMAKE ADAM Parameters appendix
  * method=iterate note and example
  * Various improved or clarified sentences
  * Remark on order=true for the median from STATS
  * Remark how to obtain QUALITY component
  * More links added
  * Changed style: e.g. co-add to coadd, S/N to SNR, \, rather than ~
    in <value> <units>, used em-dashes for breaks in sentence structure
  * \texttt for links in footnotes
  * Enlarged table scaling in PostScript
  * Added \newpage markups in the Appendix to improve PostScript layout
  * Corrections to the big configuration-parameter table
  * Link text to named section or appendix rather than to say "this appendix"
  * More typo's fixed