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/xlink.c b/xlink.c
index cb37302..2631961 100644
--- a/xlink.c
+++ b/xlink.c
@@ -45,8 +45,8 @@
  *								*
  ****************************************************************/
  
-xlinkHandlerPtr xlinkDefaultHandler = NULL;
-xlinkNodeDetectFunc	xlinkDefaultDetect = NULL;
+static xlinkHandlerPtr xlinkDefaultHandler = NULL;
+static xlinkNodeDetectFunc	xlinkDefaultDetect = NULL;
 
 /**
  * xlinkGetDefaultHandler: