preparing 2.4.21 raised a too low limit rebuilt the docs Daniel

* configure.in include/libxml/xmlwin32version.h: preparing 2.4.21
* valid.c: raised a too low limit
* doc/*: rebuilt the docs
Daniel
diff --git a/valid.c b/valid.c
index 5476f84..597a0ff 100644
--- a/valid.c
+++ b/valid.c
@@ -91,7 +91,7 @@
     unsigned char        state; /* ROLLBACK_XXX */
 } _xmlValidState;
 
-#define MAX_RECURSE 1024
+#define MAX_RECURSE 25000
 #define MAX_DEPTH ((sizeof(_xmlValidState.occurs)) * 8)
 #define CONT ctxt->vstate->cont
 #define NODE ctxt->vstate->node