Use monotonic clocks for time as appropriate
In some places, like or or, we want to use wall-clock time. But in others, like timers and so forth, we should be using a monotonic timer so we just don't have to worry about time moving backwards.
Libevent 2.1 has a subsystem for this; we could just use it as needed. Or we could snarf the code and adapt it for our uses.
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