* genChRange.py, chvalid.def, chvalid.c, include/libxml/chvalid.h:
  new files for a different method for doing range validation
  of character data.
* Makefile.am, parserInternals.c, include/libxml/Makefile.am,
  include/libxml/parserInternals.h: modified for new range method.
* catalog.c: small enhance for warning message (using one
  of the new range routines)