Issue #15338: skip test_UNC_path when the current user doesn't have enough permissions to access the path.

Issue #15300: Ensure the temporary test working directories are in the same parent folder when running tests in multiprocess mode from a Python build.
Patch by Chris Jerdonek.

execfile().

Patch contributed by Stephen Thorne.

Issue #15020: The program name used to search for Python's path is now "python3" under Unix, not "python".

Fix issue # 15033 - Return the proper exitcode for failure when modules are invoked using -m switch. Patch contributed by Jeff Knupp

the Ctrl-C signal handler on Windows

Patch by Serhiy Storchaka.

Patch by Jakub Wilk.

If messages were only added, a new file is no longer created and
renamed over the old file when flush() is called on an mbox, MMDF or
Babyl mailbox.

(helps getting results in real-time when stdio is transmitted over a pipe or socket)

Patch by Stefan Mihaila.

python executable

The __os_install_macro defines some post-processing activities during an rpm
build; one of the scripts it calls is brp-python-bytecompile, which can take
an argument: the python executable with which to byte-compile .py files in the
package payload.

In some older versions of rpm (e.g. in RHEL 6), this invocation doesn't pass
in an argument, and brp-python-bytecompile defaults to using /usr/bin/python,
which can lead to the .py files being byte-compiled for the wrong version of
python.  This has been fixed in later versions of rpm by passing in
%{__python} as an argument to brp-python-bytecompile.

Workaround this by detecting if __os_install_post has a 0-argument invocation
of brp-python-bytecompile, and if so generating an equivalent macro that has
the argument, and explicitly provide the new definition within the specfile.