[XML-SIG] Pyexpat and namespaces

[Lars Marius Garshol]

* Alexandre Fayolle
| 
| However, the instance of AttributesNSImpl passed as attrs parameter is
| created with the qname argument set to an empty dictionnary. As a
| consequence, calling getValueByQName, getNameByQName, getQNameByName,
| getQNames will lead to an exception or an unexepected result. 
| 
| I think this should be noted somewhere in the standard library
| documentation too. 

Agreed. I've updated the patch I sent to Fred.

--Lars M.