v0.86.0 - lighter archive, Critical and High filters

A lighter archive. Measured on a real installation (about 140 notifications a day): a notification
is about 5.7 KB in full and 1 KB as a summary; 40 full notifications covered the last 2-3 hours.

Changed

• archive (0.42.0): the list is read with enquire_archive verbosity: summary (SuperNotify
  2.12.1+), 150 notifications by default (limit, up to 500) - about a day, for less than the 40
  full documents of before. Only the 20 newest are read in full; any other notification is read in
  full when opened, and its row is then drawn from it. With an older SuperNotify the list is limit
  full documents, as before.
• overview (0.38.0): "channel failures today" from the daily totals of today (verbosity: daily, a few
  KB); it counted the last 40 notifications only.
• recipients (0.31.0): the last notification of each person from the light list.

Added

• archive: Critical and High filters over the whole archive (31 days), with their
  counts; shown when there is at least one (priority_filters: false hides them). How many per day
  comes from verbosity: daily (shared with the stats card), then only the days that have some are
  read, and kept in the browser.