functions.

Issue #19352: Fix unittest discovery when a module can be reached through several paths (e.g. under Debian/Ubuntu with virtualenv).

Issue #19352: Fix unittest discovery when a module can be reached through several paths (e.g. under Debian/Ubuntu with virtualenv).

Patch by Sunny K.

Patch by Sunny K.

Issue #15207: Fix mimetypes to read from correct area in Windows registry (Original patch by Dave Chambers)

Issue #15207: Fix mimetypes to read from correct area in Windows registry (Original patch by Dave Chambers)

Thanks to Marius Gedminas

prlimit() is a Linux specific command that combines setrlimit, getrlimit and can set the limit
of other processes.

Python executable and not removed by the linker's optimizer.

Python executable and not removed by the linker's optimizer.

changed output of debug messages to say "path" or "file"
extended test for filtering  certain files in a package
added test for filtering files in a python dir (no package)

This should have no effect, it's a "shouldn't happe" case.
Also tidied up some comments.