tclSE-back-port: timerate and more#3

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sebres wants to merge 12 commits intotrunkfrom

sb/_se-back-port/timerate

Commits on Jan 3, 2017

fix test-case clock-67.5 using on CET time zone (following error without `-gmt 1`, because the return value would be -3600):
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new performance measurement routine "timerate" in opposition to "time" the execution limited by fixed time (in milliseconds) instead of repetition count (more precise results, to prevent very long …
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load win-registry library also in development environment (uninstalled)
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timerate: fix for too large threshold (max value of threshold reduced to 5000 now), because otherwise sporadically stutters on some platforms on very fast iterations (<= 1µs/#)
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[win] bug fix in NativeGetTime: each call of it blurs current performance counters actualized in calibration thread in UpdateTimeEachSecond;
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bug fix in "timerate": overflow of long int by multiplication with 1000000; more precise threshold handling after NativeGetTime fix.
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minimize influence of measurement overhead (and byte code execution overhead):
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timerate: limit default calibration cycle by precision of 0.0001 (for better precision `timerate {} 10000` could be used) + increase minimal threshold;
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timerate: extend syntax with new options: timerate ?-direct? ?-calibrate? ?-overhead double? command ?time?;
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re-indent fix
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Commits on Jan 4, 2017