added xmlByteConsumed() interface updated the benchmark rebuilt the docs

* parserInternals.c xmlIO.c encoding.c include/libxml/parser.h
  include/libxml/xmlIO.h: added xmlByteConsumed() interface
* doc/*: updated the benchmark rebuilt the docs
* python/tests/Makefile.am python/tests/indexes.py: added a
  specific regression test for xmlByteConsumed()
* include/libxml/encoding.h rngparser.c tree.c: small cleanups
Daniel
40 files changed