[issue20158] Argument Clinic: add --clean option

[Larry Hastings]

Larry Hastings added the comment:

If you edit the Clinic input and don't run clinic.py on it, it's out-of-date but not broken.

If you edit the Clinic output and make a mistake, it's *your* fault.

If you ran clinic.py --clean, now you've broken your file *and* the normal Clinic build system and you were using the tool correctly.  It's the *tool's* fault.

I will admit to having very little interest in adding a command-line option called "--clean" that breaks everything.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue20158>
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