* Replace "time.clock on windows, or time.time" with time.perf_counter()
* profile module: only use time.process_time() instead of trying different
functions providing the process time
* timeit module: use time.perf_counter() by default, time.time() and
time.clock() can still be used using --time and --clock options
* pybench program: use time.perf_counter() by default, add support for
the new time.process_time() and time.perf_counter() functions, but stay
backward compatible. Use also time.get_clock_info() to display information
of the timer.
There's one major and one minor category still unfixed:
doctests are the major category (and I hope to be able to augment the
refactoring tool to refactor bona fide doctests soon);
other code generating print statements in strings is the minor category.
(Oh, and I don't know if the compiler package works.)