Bugfixes and backend work

Mostly behind-the-scenes backend work this month, plus a good number of small fixes for reported bugs.

Backhaul quality history Improved

Backhaul status history is computed from the new metrics backend, combining bandwidth metrics and ping data into a single stored quality state per backhaul.

Data-entry quality of life Improved

Small things that add up: postal codes autofill their form fields, pasting a full phone number into the area-code box splits it correctly, and the paging page nudges you to create a rule if none exist.

Pingbox connectivity fixes Fixed

Pingboxes negotiate SSH with a wider set of algorithms for older devices, and a memory leak in traffic accounting is fixed.