Initial changes to clean up the code.

tests/matrix.cpp

@@ -296,11 +296,7 @@ TEST_CASE("viewport iterator", "[matrix:viewport]") {
 
   for(size_t y = 0; y < end_y; ++y) {
     for(size_t x = 0; x < end_x && it.next(); ++x) {
-
-      println("view x/y={},{}; w/h={},{}; start={},{}",
-          it.x, it.y, it.width, it.height, it.start.x, it.start.y);
-      println("orig  x/y={},{}; w/h={},{}; start={},{}\n",
-          x+start.x, y+start.y, view_width, view_height, start.x, start.y);
+      // still working on this
     }
   }
 }