[issue20158] Argument Clinic: add --clean option

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

If you ran clinic.py --clean and then not ran clinic.py without --clean, it's 
*your* fault. And you will noticed this when run make.

I have named this option --clean because it is similar to 'make clean' and 
'make distclean'.

If you want make automatically call clinic.py, lets 'make clinic' create the 
.clinic file, 'clinic.py --clean' remove it, and 'make' check if this file 
exists and run 'make clinic' otherwise.

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