[issue11651] Improve test targets in Makefile

[Nadeem Vawda]

Nadeem Vawda <nadeem.vawda at gmail.com> added the comment:

>- when "-j0" is passed to regrtest, use the cpu count detected by multiprocessing
>- remove the duplicate test in "make test"
>- add "-j0" to the test options in make test

+1. The duplicate test seems quite wasteful (outside of testall). Is there any
reason not to add "-j0" for testall as well?

I think there is merit in keeping the quicktest target, though. Perhaps it
could be renamed to make it clear that it is only meant for use after merge
races? How does "racetest" sound?

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nosy: +nvawda

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