fix the xmlStrdup() used in the previous patch. added --dropdtd fixed

* valid.c: fix the xmlStrdup() used in the previous patch.
* valid.c: added --dropdtd
* tree.c: fixed xmlUnlinkNode so it also removes the references
  from the document if the node is a DTD
Daniel
diff --git a/ChangeLog b/ChangeLog
index 1b22e90..69a281b 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,10 @@
+Thu Dec 13 23:19:50 CET 2001 Daniel Veillard <daniel@veillard.com>
+
+	* valid.c: fix the xmlStrdup() used in the previous patch.
+	* valid.c: added --dropdtd
+	* tree.c: fixed xmlUnlinkNode so it also removes the references
+	  from the document if the node is a DTD
+
 Thu Dec 13 15:54:35 CET 2001 Daniel Veillard <daniel@veillard.com>
 
 	* HTMLtree.c valid.c: cleanup some static declarations