If bots fail due to using this flag, the buildbot scripts have to be modified
to omit it. Regrtest ignores it anyway.

Moving subprocess execution of tests into a function.

Merge test/subprocessdata/inherited.py into test/subprocessdata/fd_status.py

Unclear to me why it was pushed to begin with.  See issue 11798.
Perhaps it's because regrtest with -R was failing?  Fine, but
that's better than regrtest _always_ failing ;-)

Closes #18720.

Patch import and initialization in SearchEngine to make testing easier.
Improve docstrings, especially to clarify the double role of 'ok' parameters.
Original patch by Phil Webster.

Patch by A. Jesse Jiryu Davis.

The new names are hopefully more descriptive and consistent. If you feel you
don't agree with this change, *please* read issue 17741 first - there's a lot of
discussion in there.

runner were run in an environment where the process inherited an ignore
setting for SIGINT.  Restore the SIGINT handler to the desired
KeyboardInterrupt raising one during that test.

sizes.

parsing.  Added more tests for regrtest's argument parsing.

in docstrings and comments.

test.support, run the test if the platform matchs!

Use also os.get_inheritable() instead of fcntl() to check the inheritable flag
(FD_CLOEXEC).

are now created non-inheritable; add functions os.get/set_inheritable(),
os.get/set_handle_inheritable() and socket.socket.get/set_inheritable().

error messages and comments.