• server-status no longer leaves the "activity" column empty when a renewal is ongoing.
• server-status activity: report a renewal as "pending" when it is due but no job has been
  started yet.
• removed the "valid after" time as this was confusing. The new certificate is already
  valid, only it is recommeneded to wait with the actication a bit. Admins are probably
  better aware what the clock skew requirements of their site are.