* xmlreader.c include/libxml/xmlreader.h doc/libxml2-api.xml:
  extended the XmlTextReader API a bit, addding accessors for
  the current doc and node, and an entity substitution mode for
  the parser.
* python/libxml.py python/libxml2class.txt: related updates
* python/tests/Makefile.am python/tests/reader.py
  python/tests/reader2.py python/tests/reader3.py: updated a bit
  the old tests and added a new one to test the entities handling
Daniel