[XML-SIG] PyExpat changes for encoding

[Lars Marius Garshol]

* Greg Stein
|
| pyexpat.native_encoding as a readonly attribute. I see no particular use
| in making it a function. (Note the module-level, too!)
| parser.returns_unicode as an 0/1-valued attribute (1 is the default)

* Andrew M. Kuchling
| 
| What's the reaction to Greg's alternative proposal?  I need to know
| what to implement...

I prefer it to the other proposals. Attributes are simpler and also
fit better with the existing interface.

--Lars M.