RuntimeError on encoding surrogate pair area on UCS4 build.
This is a partial backport of r43320. (Approved by Anthony Baxter)

unicode_escape and raw_unicode_escape codec now encodes backslash correctly.

This caused another issue for unicode repr strings being double-escaped
(SF Bug #1459029). Correct fix will be in 2.5, but is too risky for 2.4.3.

Added a testcase for #1459029.

Try to repair at least one segfault on the Mac buildbot,
as diagnosed by Nick Coghlan.

test_capi.py:  A test module should never spawn a thread as
a side effect of being imported.  Because this one did, the
segfault one of its thread tests caused didn't occur until
a few tests after test_regrtest.py thought test_capi was
finished.  Repair that.  Also join() the thread spawned
at the end, so that test_capi is truly finished when
regrtest reports that it's done.

_testcapimodule.c test_thread_state():  this spawns a
couple of non-threading.py threads, passing them a PyObject*
argument, but did nothing to ensure that those threads
finished before returning.  As a result, the PyObject*
_could_ (although this was unlikely) get decref'ed out of
existence before the threads got around to using it.
Added explicit synchronization (via a Python mutex) so
that test_thread_state can reliably wait for its spawned
threads to finish.

Backport 42973 (lots of whitespace changes intermixed):

 - Reindent a confusingly indented piece of code (no intended code changes
    there)
 - Add missing DECREFs of inner-scope 'temp' variable
 - Add various missing DECREFs by changing 'return NULL' into 'goto onError'
 - Avoid double DECREF when last _PyUnicode_Resize() fails

Coverity found one of the missing DECREFs, but oddly enough not the others.

Fix a ref leak.

Move registration of the codec search function to the module scope
so it is only executed once.  Otherwise the same search function is
repeated added to the codec search path when regrtest is run with -R
and leaks are reported.

Fix SF bug #417833 (pydoc HTTP reload failure) by removing from
sys.modules all submodules of a the given module/package path
when trying to reload a module.

Handle sys.getfilesystemencoding() returning None.
ascii seems like the safest bet, it should exist.  I wonder if utf-8
would be a better choice?  This should get test_fileinput passing on OpenBSD.

SF bug # 1457358 and patch # 1458419, floor division not documented.  Patch by Andy.

SF bug #1457411, fix errors using variables that don't exist.

Rename file -> filename to be clear.

containing an encoding declaration is compile()d. Fixes
#1115379.

introduction of C calls profiling events.

Catch situations where currentframe() returns None. See SF patch #1447410, this is a different implementation.

used by encoding tests.  Fiddled the Windows buildbot helper
scripts to invoke this if needed.  Note that this isn't needed
on the trunk (the encoding tests download input files automatically
in 2.5).

patch from the trunk.

This stops test_socket_ssl from dying with:

    TypeError: 'NoneType' object is not callable

in urlparsre.py's urljoin() when the tests are run in this order:

    test_???
    test_importhooks
    test_socket_ssl

"test_???" can be various things, but must be there.  For
example, test_urllibnet "works" to provoke the failure.

Alas, nobody actually understands _why_ test_socket_ssl fails
then, or why this hack makes the problem go away.

Amazingly, the tests just happened to run in the right order on
the 2.4 branch on two Windows buildbot slaves today, causing them
both to fail their most recent test runs before this patch.

Fix problem spotted by Coverity that occurs if tzinfo.tzname().replace()
returns a non-string when converting %Z.

 kills GUI.  Report from Bruce Sherwood.

"""
Try to find a host that responds slower from python.org so this test
does not fail on macteagle (G4 OSX.4 in buildbot)
"""

Since testConnectTimeout() frequently fails in the same way in 2.4
branch, and this patch seems to have fixed it on the trunk, it
should fix it on the 2.4 branch too.

Set eol-style to native.