[issue8325] improve regrtest command line help

[anatoly techtonik]

anatoly techtonik <techtonik at gmail.com> added the comment:

Éric: svn merge

R.David Murray: "The numbers should definitely not be there." is not an argument.  `python regrtest.py` should also be a supported way to run regression suite.  With only -m favor documented somebody can quickly forget about it.  I use Mercurial clones for development, I also can't compile Windows binaries (no money, space and time for VS), so it is important for me to be able to run regrtest.py manually from the same directory I am hacking tests and global interpreter.

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