directory permissions and times.

(will backport to 2.5)

compatibility after r59671 made them return integral types.

* Make the _replace() method respect subclassing.

* Using property() to make _fields read-only wasn't a good idea.
  It caused len(Point._fields) to fail.

* Add note to _cast() about length checking and alternative with the star-operator.

On Windows, when import fails to load a dll module, the message says
"error code 193" instead of a more informative text.

It turns out that FormatMessage needs additional parameters for some error codes.
For example: 193 means "%1 is not a valid Win32 application".
Since it is impossible to know which parameter to pass, we use
FORMAT_MESSAGE_IGNORE_INSERTS to get the raw message, which is still better
than the number.

Modified PyImport_Import and PyImport_ImportModule to always use absolute imports by calling __import__ with an explicit level of 0
Added a new API function PyImport_ImportModuleNoBlock. It solves the problem with dead locks when mixing threads and imports

Some build bots don't compile mathmodule. There is an issue with the long definition of pi and euler

Regular Expression inline flags not handled correctly for some unicode
characters.  (Forward port from 2.5.2.)

the complex_pow part), r56649, r56652, r56715, r57296, r57302, r57359, r57361,
r57372, r57738, r57739, r58017, r58039, r58040, and r59390, and new
documentation. The only significant difference is that round(x) returns a float
to preserve backward-compatibility. See http://bugs.python.org/issue1689.

based on the VS 2008 build directory to PC/VS8.0. The script
PCbuild/vs8to9.py was added to sync changes from PCbuild to PC/VS8.0.

Kristjan, the initial creator of the PCbuild8 directory is fine with the replacement. I've moved the new version of the VS 2005 build directory next to the other legacy build directories. The new sync script is based on the work of wreck and syncs changes in the project, property and solution files.

r58207 and r58247 patch logic is reversed.  I noticed this when I
tried to use urllib to retrieve a file which required auth.

Fix that and add a test for 401 error to verify.

This improves compatibility with Tcl 8.5, which would
otherwise return textindex objects.

Fixes Tk issue #1851526