Mark Pizzolato aa82b57d10 TIMER: Fix various inconsistent timing behaviors ...

- Support for arbitrary long wait intervals in sim_activate_after with
   precisely correct delays aligned with the calibrated clock once
   per second.
- Proper handling of calls to sim_cancel for calibrated timer units
- Properly allow stopping of calibrated clock by calling sim_rtcn_calb
   with a ticksper == 0
- Only schedule asynchronous timer activities for delays longer than
   the minimal OS sleep time
- Only wake asynchronous timer thread to queue new timer events
   that are shorter than the currently shortest scheduled event

2016-12-26 12:42:25 -08:00

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