Applied the last patches from Gary, cleanup, activated threading all user

* include/libxml/SAX.h include/libxml/globals.h include/libxml/parser.h
  include/libxml/parserInternals.h include/libxml/tree.h
  include/libxml/xmlerror.h HTMLparser.c SAX.c error.c globals.c
  nanoftp.c nanohttp.c parser.c parserInternals.c testDocbook.c
  testHTML.c testSAX.c tree.c uri.c xlink.c xmlmemory.c:
  Applied the last patches from Gary, cleanup, activated threading
  all user accessible global variables are now handled in globals.[ch]
  Still a bit rought but make tests passes with either
  --with-threads defined at configure time or not.
* Makefile.am example/Makefile.am: added globals.[ch] and threads
  linking options
Daniel
diff --git a/testDocbook.c b/testDocbook.c
index cea9f93..8822fa3 100644
--- a/testDocbook.c
+++ b/testDocbook.c
@@ -74,7 +74,8 @@
     NULL, /* xmlParserError */
     NULL, /* getParameterEntity */
     NULL, /* cdataBlock */
-    NULL  /* externalSubset */
+    NULL, /* externalSubset */
+    1
 };
 
 xmlSAXHandlerPtr emptySAXHandler = &emptySAXHandlerStruct;
@@ -609,7 +610,8 @@
     fatalErrorDebug,
     getParameterEntityDebug,
     cdataBlockDebug,
-    externalSubsetDebug
+    externalSubsetDebug,
+    1
 };
 
 xmlSAXHandlerPtr debugSAXHandler = &debugSAXHandlerStruct;