Improved the handling of matrices in serialization so that it's more reliable,

change was to use doubles for reading and writing matrices regardless of type of Matrix
being serialized.

Change does break backwards compatibility though, so code
path supporting original format has been left in for the
time being.  However, this code is not reliable enough and
is over complicated compared to the simplified handling.   Once
the new code has been bedded down for a while I'll remove this code block.

include/osgDB/Serializer

@@ -336,14 +336,17 @@ public:
     
     virtual bool write( OutputStream& os, const osg::Object& obj )
     {
+
         const C& object = OBJECT_CAST<const C&>(obj);
         const osg::Matrix& value = (object.*_getter)();
         if ( os.isBinary() )
         {
+            OSG_NOTICE<<"MatrixSerializer::write() binary"<<std::endl;
             os << value;
         }
         else if ( ParentType::_defaultValue!=value )
         {
+            OSG_NOTICE<<"MatrixSerializer::write() ascii, ParentType::_name="<<ParentType::_name<<std::endl;
             os << PROPERTY((ParentType::_name).c_str()) << value << std::endl;
         }
         return true;
@@ -352,6 +355,9 @@ public:
 protected:
     void readMatrixImplementation( InputStream& is, osg::Matrix& matrix )
     {
+#if 1
+        is >> matrix;
+#else
         if ( is.getUseFloatMatrix() )
         {
             osg::Matrixf realValue; is >> realValue;
@@ -362,6 +368,7 @@ protected:
             osg::Matrixd realValue; is >> realValue;
             matrix = realValue;
         }
+#endif
     }
     
 public: