[XML-SIG] SAX 2.0 modifications

[Lars Marius Garshol]

I've had a quick look through the files now before I go offline for
the weekend, and these are the changes I see now that I would like to
make. See 

<URL: http://www.python.org/pipermail/xml-sig/2000-July/004650.html > 

for some background.


 __init__.py:		Add make_parser.

 _exceptions.py:	No changes.

 expatreader.py:	Support for features and props.
			Support for external entity references.
			DocumentHandler *NS methods.
			Attributes.

 handler.py:		DocumentHandler *NS methods.
			Attributes.

 saxutils.py:		Update to interface changes.
			Make XMLGenerator NS-friendly.

 xmlreader.py:		Edit in DTDHandler and EntityResolver stuff.
			Modify AttributesImpl to new interface.
			Minor changes to IncrementalParser?
		

I also have a patch to pyexpat.c that would add support for external
entities, contributed by Oliver Gathmann.
	
--Lars M.