link ppd files to sw/ppd, drop old documentation
Merge commit '3a82859490c0cf869b9a7be3f292adf363fb17e7' into experimental/cups-1.6-and-1.7

* commit '3a82859490c0cf869b9a7be3f292adf363fb17e7':
  updates
Merge branch 'experimental/cups-1.6-and-1.7' into refs/top-bases/experimental/marc

* experimental/cups-1.6-and-1.7:
  link ppd files to sw/ppd, drop old documentation
Merge remote-tracking branch 'refs/remotes/gh/experimental/marc' into HEAD

* refs/remotes/gh/experimental/marc: (111 commits)
  New TopGit dependency: experimental/clawsmail
  myhasktags update
  fix tigervnc ctrl-* keys, eg ctrl-c ctrl-v ctrl-d by applying patch to fltk
  fix, why did this happen ?
  adding whatsapp plugin
  tgDel: removing dependency refs/heads/experimental/marc. Probably this topic was merged upstream (?)
  tgDel: removing dependency refs/heads/experimental/marc. Probably this topic was merged upstream (?)
  tgDel: removing dependency refs/heads/experimental/marc. Probably this topic was merged upstream (?)
  Revert "nscd: Fix LD_LIBRARY_PATH"
  tgDel: removing dependency refs/heads/experimental/marc. Probably this topic was merged upstream (?)
  tgDel: removing dependency refs/heads/experimental/marc. Probably this topic was merged upstream (?)
  tgDel: removing dependency refs/heads/experimental/marc. Probably this topic was merged upstream (?)
  xsbt is outdated
  merge failure
  depend on cups update
  opt-out cups update:
  Fix .deepOverride on poppler, glib by moving the default derivation into callPackage call
  nix
  New TopGit dependency: experimental/php-koellner-phonetic
  New TopGit dependency: marc-nixos/postfix
  ...