added new function xmlSchemaValidCtxtGetParserCtxt based on Holger

* include/libxml/xmlschemas.h xmlschemas.c: added new function
  xmlSchemaValidCtxtGetParserCtxt based on Holger Kaelberer patch
* doc/apibuild.py doc/*: regenerated the doc, chased why the new
  function didn't got any documentation, added more checking in the
  generator
* include/libxml/relaxng.h include/libxml/schematron.h
  include/libxml/xmlschemas.h include/libxml/c14n.h
  include/libxml/xmlregexp.h include/libxml/globals.h
  include/libxml/xmlreader.h threads.c xmlschemas.c: various changes
  and cleanups following the new reports
Daniel

svn path=/trunk/; revision=3738
30 files changed