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

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

Lib/imp.py for imp.source_from_cache() instead of its own C version.

Also change PyImport_ExecCodeModuleObject() to not infer the source
path from the bytecode path like
PyImport_ExecCodeModuleWithPathnames() does. This makes the function
less magical.

This also has the side-effect of removing all uses of MAXPATHLEN in
Python/import.c which can cause failures on really long filenames.

the Python 3.3 change notice on them in case someone directly links to
the function(s).

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.

default on Windows and OS X as it already does with X11 Tk.

Issue #15296: Fix minidom.toxml/toprettyxml for non-unicode encodings.  Patch by Serhiy Storchaka, with some minor style adjustments by me.

algorithm from decimal.py for mpd_qsqrt().

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.

statement (e.g. ``from distutils import msvc9compiler``) that triggers
an ImportError of its own (e.g. the non-existence of winreg), let that
exception propagate instead of raising a generic ImportError for the
module being requested (e.g. msvc9compiler).

Lib/imp.py.