Added support for PagedLOD node into .ive format and added support for

Enabled texture object reuse by setting an expiry delay in the TextureObjectManager
of 10 seconds - done for both osgDB::DatabasePager and TXP plugin.

src/osgPlugins/ive/DataInputStream.cpp

@@ -33,6 +33,7 @@
 #include "Billboard.h"
 #include "Sequence.h"
 #include "LOD.h"
+#include "PagedLOD.h"
 //#include "ViewPoint.h"
 #include "PositionAttitudeTransform.h"
 #include "Transform.h"
@@ -556,6 +557,10 @@ osg::Node* DataInputStream::readNode()
         node = new osg::LOD();
         ((ive::LOD*)(node))->read(this);
     }
+    else if(nodeTypeID== IVEPAGEDLOD){
+        node = new osg::PagedLOD();
+        ((ive::PagedLOD*)(node))->read(this);
+    }
     else if(nodeTypeID== IVESWITCH){
         node = new osg::Switch();
         ((ive::Switch*)(node))->read(this);