Based on patches by Konstantin Molchanov and Neil Girdhar.

Patch by James Pickering.

some upstream vendors may do to their odd "FIPS compliant" builds.
issue15468.

document that md5 may be missing in the rare case someone is using a
"FIPS compliant" build.  I've only ever heard of Redhat creating one
of those - CPython itself offers no such build mode out of the box.

Patch by Jason Fried.

Patch by Gareth Rees.

It was documented since 07a5610bae9d.

Initial patch by Roger Luethi.

Reformat header above separator line (added if missing) to a common format.
Patch by Yoni Lavi.

(Just updated NEWS.)

regular expressions now are errors.

Patch by David Coles.

Patch by Łukasz Langa.