v0.14.0

A cluster whose machine is off shows up as offline at once: switchyard dials the API server first (2 s at most, kept 5 s) instead of waiting for kubectl's own retries, and the boxes list gets the offline card too. A power-on command (Redfish, IPMI, Wake-on-LAN or anything else, with an optional user and password in its environment) can be set on the Login page with the password; while the cluster is offline every page then offers Start server.