Various contributed patches:

- uri.c: applied patch for URI escaping from Wayne Davison
  <wayned@blorf.net>
- tree.c parserInternals.c HTMLparser.c: memset checks patches
  from Denis Barbier <barbier@imacs.polytechnique.fr>
- HTMLparser.c: UTF8 characters in HTML tag-attribute values
  patch from Wayne Davison
Daniel

parserInternals.c

@@ -2054,7 +2054,8 @@ xmlInitParserCtxt(xmlParserCtxtPtr ctxt)
     if (sax == NULL) {
         fprintf(stderr, "xmlInitParserCtxt: out of memory\n");
     }
-    memset(sax, 0, sizeof(xmlSAXHandler));
+    else
+        memset(sax, 0, sizeof(xmlSAXHandler));
 
     /* Allocate the Input stack */
     ctxt->inputTab = (xmlParserInputPtr *) xmlMalloc(5 * sizeof(xmlParserInputPtr));