[XML-SIG] drv_jython

[Lars Marius Garshol]

I finally got round to making a SAX 2.0 driver for the Java SAX 2.0
parsers, for use in Jython. It is not yet complete, but I did use it
successfully last night to convert a 1.2 MB XML file into a topic map.

Should I check it into the main branch, or should I put it on some
other branch?

Also, I guess we should use different lists of default parsers in
Jython and CPython.

  Jython: drv_jython, drv_xmlproc
  CPython: expatreader, drv_xmlproc

This change is more risky, in that it will make people suddenly start
using drv_jython, before it has been properly tested. Comments?

--Lars M.