Add my Casting operators back to the base Ref. Also change the header guard...

Add my Casting operators back to the base Ref.  Also change the header guard so that it doesnt conflict with 3ds max's ref.h

Ref.h

 /* Copyright (c) 2006, NIF File Format Library and Tools
 All rights reserved.  Please see niflib.h for licence. */
 
-#ifndef _REF_H_
-#define _REF_H_
+#ifndef _NIFLIB_REF_H_
+#define _NIFLIB_REF_H_
 
 #include <ostream>
 namespace Niflib {
@@ -12,12 +12,25 @@ namespace Niflib {
  */
 
 template<class T> class Ref;
-template<class T> ostream & operator<<(ostream &, const Ref<T> &);
+template<class T> std::ostream & operator<<(std::ostream &, const Ref<T> &);
 
 template <class T> class Ref {
 public:
 	Ref( T * object = NULL );
 	Ref(const Ref & ref_to_copy );
+
+#ifdef USE_NIFLIB_TEMPLATE_HELPERS
+   template<typename U> Ref( const Ref<U>& other ) { 
+      if ( (NULL != other._object) && other._object->IsDerivedType(T::TypeConst()) ) {
+         _object = static_cast<T*>(other._object);
+         if ( _object != NULL )
+            _object->AddRef();
+      } else {
+         _object = NULL;
+      }
+   }
+#endif
+
 	~Ref();
 
 	T& operator*() const;
@@ -33,7 +46,7 @@ public:
 
 	//These operators generate problems in SWIG
 #ifndef SWIG
-	friend ostream & operator<< <T>(ostream & os, const Ref & ref);
+   friend std::ostream & operator<< <T>(std::ostream & os, const Ref & ref);
 	Ref & operator=( T * object );
 	Ref & operator=( const Ref & ref );
 	operator T*() const;
@@ -41,6 +54,9 @@ public:
 #endif
 
 protected:
+#ifdef USE_NIFLIB_TEMPLATE_HELPERS
+   template<typename U> friend class Ref;
+#endif
 	//The shared object
 	T* _object;
 };
@@ -176,7 +192,7 @@ bool Ref<T>::operator!=(const Ref & ref) const {
 
 #ifndef SWIG
 template <class T>
-ostream & operator<<(ostream & os, const Ref<T> & ref) {
+std::ostream & operator<<(std::ostream & os, const Ref<T> & ref) {
 	if (ref._object)
 		os << ref->GetIDString();
 	else