error if faulthandler.dump_tracebacks_later() is missing (e.g. if Python is
compiled without threads).

Add TESTTIMEOUT variable (default: 3600 seconds). Use TESTTIMEOUT=0 to disable
the timeout.
***
fix

It's unclear what this was referring to; most likely, it was about sockets
that the application had already closed, in which case it's not a sockets
problem, but an application problem.

Issue #12080: Fix a performance issue in Decimal._power_exact that causes some corner-case Decimal.__pow__ calls to take an unreasonably long time.

test_multibytecodec_support. Improve also error message of the
test_errorhandle() of TestBase.

test_multibytecodec_support. Improve also error message of the
test_errorhandle() of TestBase.

The previous markup hijacked the abstract-base-classes glossary entry,
which resulted in the HTML linking to collections.abc when defining the
generic ABC concept.  Now the glossary links to the abc module.

I’m afraid my docstring is not as clear as it should be, but I can’t
find a concise way of describing what the code does.  Suggestions for
improvements welcome.

Keep a timeout of 1 hour for buildbots.

Also promote notices from distutils doc to deprecation boxes.