Adds bztar format to generate .tar.bz2 tarballs

Uses the -f argument to overright old tarballs automatically, I am
assuming that if the old tarball was wanted it would have been moved or
else the version number would have been changed.

Uses the -9 argument to bzip2 and gzip to use maximum
compression. Compress uses the maximum compression by default.

Tests for correct value for the 'compress' argument of make_tarball. This
is one less place for someone adding new compression programs to forget to
change.

Improvements:
- does no longer need any extra memory
- has no relationship to tstate
- works in debug mode
- can easily be modified for free threading (hi Greg:)

Side effects:
Trashcan does change the order of object destruction.
Prevending that would be quite an immense effort, as
my attempts have shown. This version works always
the same, with debug mode or not. The slightly
changed destruction order should therefore be no problem.

Algorithm:
While the old idea of delaying the destruction of some
obejcts at a certain recursion level was kept, we now
no longer aloocate an object to hold these objects.
The delayed objects are instead chained together
via their ob_type field. The type is encoded via
ob_refcnt. When it comes to the destruction of the
chain of waiting objects, the topmost object is popped
off the chain and revived with type and refcount 1,
then it gets a normal Py_DECREF.

I am confident that this solution is near optimum
for minimizing side effects and code bloat.

socklen_t (unsigned int) for most size parameters.  Apparently this is
part of the UNIX 98 standard.

[GvR: the changes to configure.in etc. that I just checked in make
sure that socklen_t is defined everywhere, so I deleted the little
part of Jack's mod to define socklen_t if not in GUSI2.  I suppose I
will have to add it to the Windows config.h in a minute.]

doesn't use the special header file for select anymore.

has a few slightly different calls from the old one.

the change to regrtest.py to unload all newly imported modules did
something bad to the threads -- and I realized that they would never
stop!

This uses the same precautions when trying to find a temporary
directory as when the actual tempfile is created (using O_CREAT and
O_EXCL).  On non-posix platforms, nothing is changed.

Don't build the _tkinter project from Build, only the one from Extensions:Imaging, which now drops its resulting .slb into the PlugIns folder.

The fix also adds support for POSTing to an https URL

The .exp file hadn't been regenerated after adding the threading stuff. This means that building a nonthreaded PythonCore will now require massaging of the .exp.

Added a note about Personal Webserver, and replaced "netpresenz" by a list of the current mac webservers.

Added Corran Webster's explanation of how to write extensions in MPW and a pointer to his W documentation.

added 'abspath()' and 'extend()'.

exceptions better.

errors in the setup script or on the command line, so shouldn't result
in a traceback.

  'make_archive()' to a global static dictionary, ARCHIVE_FORMATS.
Added 'check_archive_formats()', which obviously makes good use of
  this dictionary.

and the other "composite meta-data" methods.