use CLOCK_MONOTONIC instead of CLOCK_REALTIME for timer setup

CLOCK_REALTIME is a wall clock, that could change back and forth (user
changes system time, winter/summer time, NTP corrections and so on).
For real-time application CLOCK_MONOTONIC should be used, it doesn't
have such jumps.

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.. Beremiz documentation master file

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Beremiz's documentation

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=======================

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Contents:

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.. toctree::

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   :maxdepth: 2

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   overview

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   manual/index

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   standards

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