[XML-SIG] Uniform interface with Python 2.0

[Lars Marius Garshol]

* Lars Marius Garshol
|
| It should probably appear as
| 
| from xml import sax
| parser = sax.make_parser()
|
| I think we should extend it so that the default parser list can be
| modified both from Python code and set via an environment variable
| (PY_SAX_PARSER?).  Other than that I think SAX 1.0 showed this
| approach to be very successful.

This has now been implemented and is ready to be tested against Python
2.0 and checked in. It works with Python 1.5.2 and JPython 1.1, and
uses the Java property python.xml.sax.parser from sys.registry in
JPython.

--Lars M.