Hints for fmit in main

Warnings

• ancient-metadata
  The AppStream metadata should be updated to follow a more recent version of the specification.
  Please consult the XML quickstart guide for more information.
• screenshot-download-error
  Error while downloading screenshot from 'http://home.gna.org/fmit/figs/simple.png': HTTP request returned status code 404 (Not Found)
  This might be a temporary server issue.
• screenshot-download-error
  Error while downloading screenshot from 'http://home.gna.org/fmit/figs/complete.png': HTTP request returned status code 404 (Not Found)
  This might be a temporary server issue.
• screenshot-download-error
  Error while downloading screenshot from 'http://home.gna.org/fmit/figs/microtonal.png': HTTP request returned status code 404 (Not Found)
  This might be a temporary server issue.
• screenshot-download-error
  Error while downloading screenshot from 'http://home.gna.org/fmit/figs/statistics.png': HTTP request returned status code 404 (Not Found)
  This might be a temporary server issue.