added missing code changes

started working on refactoring of sensors
new test-cases

grid/factory/GridFactory.h

@@ -293,6 +293,9 @@ public:
 		// get the original grid's bbox
 		BBox3 bb = gIn.getBBox();
 
+		// ensure we have an outer boundary
+		bb.grow(gIn.getGridSize_cm() * 2);
+
 		const int gridSize_cm = grid.getGridSize_cm();
 
 		// build new grid-points