Finish XML refactoring

This patch finishes the refactoring of the XML package in
five different 
packages.  It is now possible to load XML-XMLNodeBuilder
without loading 
XML-XMLParser (which may mean, in a remote future, being
able to use the 
XSL engine with an Expat-based parser), and to load
XML-SAXParser 
without loading XML-DOM (because it does not make sense that
you need 
to).  In doing so, I removed one more abstract method from 
XML-SAXParser.  Also, InputSource is a SAX defined class, so
I moved it 
up to XML-SAXDriver.

Paolo

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