Supermatter fixes, code cleanup and refactoring. Shards don't announce anything.

Also minor tweaks to shard values.
There was a bug. I raised it from 15 to 20 seconds, lowered the 'critical' message from 30 to 18 seconds or so.

> The delay of regular warning was made *higher* (from 15 to 20 seconds) because of a bug; Delay of the emergency warning was lowered (from 30 to approx. 12 seconds).