[XML-SIG] Preparing for PyXML 0.7

[Martin v. Loewis]

As some may have noticed, I'm in the progress of putting together
PyXML 0.7. For the moment, I'd like contributors to review
README/ANNOUNCE for thing that are missing (focusing on new features;
bug fixes won't be listed individually unless somebody volunteers to
determine them all).

Further, if you have a list of things that you want to do before 0.7,
don't hesitate to share them with us.

Regards,
Martin