release of 2.4.20 updated and rebuilt the docs Daniel

* configure.in: release of 2.4.20
* doc/*: updated and rebuilt the docs
Daniel
diff --git a/configure.in b/configure.in
index a11bcb9..e673893 100644
--- a/configure.in
+++ b/configure.in
@@ -6,7 +6,7 @@
 
 LIBXML_MAJOR_VERSION=2
 LIBXML_MINOR_VERSION=4
-LIBXML_MICRO_VERSION=19
+LIBXML_MICRO_VERSION=20
 LIBXML_VERSION=$LIBXML_MAJOR_VERSION.$LIBXML_MINOR_VERSION.$LIBXML_MICRO_VERSION
 LIBXML_VERSION_INFO=`expr $LIBXML_MAJOR_VERSION + $LIBXML_MINOR_VERSION`:$LIBXML_MICRO_VERSION:$LIBXML_MINOR_VERSION