Add os.monotonic to expose a monotonic timer.
#120
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`os.clock` uses libc's `clock` which measure "user + sys" time which is very rarely useful. This patch adds a new timer `os.monotonic` which returns a monotonic timer. On Linux, none of the monotonic timers is documented to do exactly what we would like: of those available, `MONOTONIC` seems the option least likely to produce misleading results, so we pick that.
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os.clockuses libc'sclockwhich measure "user + sys" time which is very rarely useful. This patch adds a new timeros.monotonicwhich returns a monotonic timer. On Linux, none of the monotonic timers is documented to do exactly what we would like: of those available,MONOTONICseems the option least likely to produce misleading results, so we pick that.