This code passes all the same tests that the existing RFC mime header
parser passes, plus a bunch of additional ones.

There are a couple of commented out tests where there are issues with the
folding.  The folding doesn't normally get invoked for headers parsed from
source, and the cases are marginal anyway (headers with invalid binary data)
so I'm not worried about them, but will fix them after the beta.

There are things that can be done to make this API even more convenient, but I
think this is a solid foundation worth having.  And the parser is a full RFC
parser, so it handles cases that the current parser doesn't.  (There are also
probably cases where it fails when the current parser doesn't, but I haven't
found them yet ;)

Oh, yeah, and there are some really ugly bits in the parser for handling some
'postel' cases that are unfortunately common.

I hope/plan to to eventually refactor a lot of the code in the parser which
should reduce the line count...but there is no escaping the fact that the
error recovery is welter of special cases.

preserve all 64 bits of hash on Win64.

properly skip uncompilable files and to compile existing
files in site-packages if reinstalling.  Also, no longer
attempt to install a documentation link in /Developer
as that no longer necessarily exists with Xcode 4.3+.

We need a discussion to define what should be customized how; this new
config file is premature.  It was added to serve the needs of the
resources system in install_data / packaging.database, so it can be
removed alongside packaging for 3.3.

no longer lose data when an underlying read system call is interrupted.
IOError is no longer raised due to a read system call returning EINTR
from within these methods.

installer package from the OS X Makefile for Python 3.  It has
never worked on Python 3 and is not needed there as pre-10.3.9
installs are no longer supported.

no longer lose data when an underlying read system call is interrupted.
IOError is no longer raised due to a read system call returning EINTR
from within these methods.

alarm for the signal tests.

(This was not done in the previous commit because Mercurial would have
shown it as a modified file instead of a moved file.)

Distutils2 will live on on PyPI and be included in the stdlib when it
is ready.  See discussion starting at
http://mail.python.org/pipermail/python-dev/2012-June/120430.html

#11113: add a new "html5" dictionary containing the named character references defined by the HTML5 standard and the equivalent Unicode character(s) to the html.entities module.

parameter from os.remove / os.unlink.
Patch written by Georg Brandl.  (I'm really looking forward to George
getting commit privileges so I don't have to keep doing checkins on his
behalf.)

(this could reveal test failures!)

- Try to avoid building Python or extension modules with problematic
  llvm-gcc compiler.
- Since Xcode 4 removes ppc support, extension module builds now
  check for ppc compiler support and automatically remove ppc and
  ppc64 archs when not available.
- Since Xcode 4 no longer install SDKs in default locations,
  extension module builds now revert to using installed headers
  and libs if the SDK used to build the interpreter is not
  available.
- Update ./configure to use better defaults for universal builds;
  in particular, --enable-universalsdk=yes uses the Xcode default
  SDK and --with-universal-archs now defaults to "intel" if ppc
  not available.

Also add an explicit test for safe implementation usage on supported platforms.

As a side effect, this commit adds a module-level attribute 'rmtree_is_safe'
which offers introspection whether the current rmtree implementation is safe
against symlink attacks.