[issue23552] Have timeit warn about runs that are not independent of each other

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

Implemented Robert's suggestion.

$ ./python -m timeit -n1 -r 10 -s "import time, random" -- "time.sleep(random.random())"
1 loops, best of 10: 30.2 msec per loop
:0: UserWarning: The test results are likely unreliable. The worst
time (946 msec) was more than four times slower than the best time.

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Added file: http://bugs.python.org/file38533/timeit_python_warning_2.diff

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