removed gridSize from the template arguments

- not needed and code much cleaner
some minor changes
new test-cases

grid/GridNode.h

@@ -4,7 +4,8 @@
 #include "GridNodeBBox.h"
 #include "GridPoint.h"
 
-template<int, typename> class Grid;
+/** forward decl. */
+template<typename> class Grid;
 
 
 /**
@@ -17,7 +18,8 @@ struct GridNode {
 
 private:
 
-	template<int, typename> friend class Grid;
+	/** grant full access to the grid */
+	template<typename> friend class Grid;
 
 	/** INTERNAL: array-index */
 	int _idx;