- Large resync between W3C and Gnome tree

- configure.in: 2.1.0 prerelease
- example/Makefile.am example/gjobread.c tree.h: work on
  libxml1 libxml2 convergence.
- nanoftp, nanohttp.c: fixed stalled connections probs
- HTMLtree.c SAX.c : support for attribute without values in
  HTML for andersca
- valid.c: Fixed most validation + namespace problems
- HTMLparser.c: start document callback for andersca
- debugXML.c xpath.c: lots of XPath fixups from Picdar Technology
- parser.h, SAX.c: serious speed improvement for large
  CDATA blocks
- encoding.[ch] xmlIO.[ch]: Improved seriously saving to
  different encoding
- config.h.in parser.c xmllint.c: added xmlCheckVersion()
  and the LIBXML_TEST_VERSION macro
Daniel

uri.c

@@ -1513,7 +1513,10 @@ xmlBuildURI(const xmlChar *URI, const xmlChar *base) {
 	val = xmlSaveUri(ref);
 	goto done;
     }
-    res->scheme = xmlMemStrdup(bas->scheme);
+    if (bas->scheme != NULL)
+	res->scheme = xmlMemStrdup(bas->scheme);
+    else
+	res->scheme = NULL;
 
     /*
      * 4) If the authority component is defined, then the reference is a