preparing a 2.6.0-beta2 release avoid a warning avoid duplicate code in

* configure.in: preparing a 2.6.0-beta2 release
* xmlIO.c: avoid a warning
* tree.c: avoid duplicate code in xmlReplaceNode as pointed out
  by Chris Ryland
* include/libxml/dict.h: add a QName access lookup to the
  dictionary.
* xmlreader.c include/libxml/xmlreader.h: adding const access
  based on the dictionary interface for string read from the
  reader, the node content access is still TODO, it's too different
Daniel

python/libxml2class.txt

@@ -650,6 +650,12 @@ Class xmlTextReader(xmlTextReaderCore)
     AttributeCount()
     BaseUri()
     Close()
+    ConstBaseUri()
+    ConstLocalName()
+    ConstName()
+    ConstNamespaceUri()
+    ConstPrefix()
+    ConstXmlLang()
     CurrentDoc()
     CurrentNode()
     Depth()