Added
- A Detailed CPU usage panel under Advanced, refreshing every three seconds while it is open, beside the process list - which becomes Process memory, now that it is one of two. (#91)
ps -o pcpu on this busybox reports the average since a process started, so anything that worked hard at boot reads high forever - systemd sits at 2.4% on an idle set. The counters in /proc are read twice instead, seven tenths of a second apart, and the difference is what is actually running. Percentages are of the whole processor rather than of one core, so they can be read against the CPU figure on the Metrics tab.
Measuring stops when the panel is closed and while the page is hidden: each read costs the TV two passes over /proc.