Surprising behaviour of the "$" regexp: it matches the
end of the string, AND just before the newline at the end
of the string::

    re.sub('$', '#', 'foo\n') == 'foo#\n#'

Python is consistent with Perl and the pcre library, so
we just document it.
Guido prefers "\Z" to match only the end of the string.

to use the required versions of external sources.
External sources are not yet built, so the build-step fails to
built some targets.

to use the required versions of external sources.
External sources are not yet built, so the build-step fails to
built some targets.

SRE_MATCH so that signal handlers can be invoked during
long regular expression matches.  It also adds a new
error return value indicating that an exception
occurred in a signal handler during the match, allowing
exceptions in the signal handler to propagate up to the
main loop.  Thanks Josh Hoyt and Ralf Schmitt.

Added ExpandEnvironmentStrings to the _winreg module.

This prevents traceback prints pointing to files in this way:

  File "\loewis\25\python\Modules\_ctypes\callbacks.c", line 206, in 'calling callback function'

Patch 1114: fix compilation of curses module on 64-bit AIX, and any other LP64 platforms where attr_t isn't a C long

by the current context.  Thanks Mark Dickinson.