Integrated various changes worked on at the Glasgow Science Center. Changes

include change the CameraManipulators so they work with double for time
instead of float.  Also added support for DataType to osg::StateAttribute
and StateSet so that they can be set to either STATIC or DYNAMIC, this
allows the optimizer to know whether that an attribute can be optimized
or not.

include/osg/StateSet

@@ -50,7 +50,10 @@ class SG_EXPORT StateSet : public Object
             nodes which inherit all of their modes for the global state.*/
         void setAllToInherit();
         
-        /** merge this stateset with stateset rhs, this overrides
+        inline void setDataType(osg::StateAttribute::DataType type) { _datatype = type; }
+        inline const osg::StateAttribute::DataType getDataType() const { return _datatype; }
+
+       /** merge this stateset with stateset rhs, this overrides
           * the rhs if OVERRIDE is specified, otherwise rhs takes precedence.*/
         void merge(const StateSet& rhs);
 
@@ -169,6 +172,8 @@ class SG_EXPORT StateSet : public Object
         int             _binNum;
         std::string     _binName;
 
+        osg::StateAttribute::DataType _datatype;
+
 };
 
 }