* parser.c: fixing bug #108976 get the ID/REFs to reference
  the ID in the document content and not in the entity copy
* SAX.c include/libxml/parser.h: more checking of the ID/REF
  stuff, better solution for #107208
* xmlregexp.c: removed a direct printf, dohhh
* xmlreader.c: fixed a bug on streaming validation of empty
  elements in entities
* result/VC/ElementValid8 test/VCM/v20.xml result/valid/xhtml1.xhtml:
  cleanup of the validation tests
* test/valid/id* test/valid/dtds/destfoo.ent result/valid/id*:
  added more ID/IDREF tests to the suite
Daniel