topline - 0.5-1+b1 main

This is a top-of-the-line logger of CPU usage patterns, designed for
machines with ca. 50-300 total hardware threads (fewer works but results
in a narrow graph, more requires a very wide terminal). Every per-tick
sample is shown abusing Unicode characters to fit within a single line.
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Disk usage is also shown in a similarly terse per-device way, as %
utilization for reads and writes.