Improvements to find-recent-urgent for meeting agenda

Ben Hutchingsrequested to merge
benh/kernel-team:import-fru into master
  • Escape '~' and <digit> '.' in Markdown output
  • Replace severity_num dict with enumeration class
  • Group merged bug reports together
  • Aggregate new upstream status by source package
  • Stabilise bug list ordering
Edited by Ben Hutchings

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