some debug prints

I'm noticing a bug where I click on a node sometimes and the cursor
doesn't appear. It's in driver.love, but I can't exclude it might be in
this fork as well. Might as well spread debug prints everywhere I might
catch this.

0006-on.mouse_press

@@ -8,7 +8,9 @@ on.mouse_press = function(x,y, mouse_button)
 	if node then
 		-- position cursor in node
 		Cursor_node = node
+		print('within node')
 		edit.mouse_press(node.editor, x,y, mouse_button)
+		print('cursor at', node.editor.cursor_x, node.editor.cursor_y)
 		return
 	end
 	-- pan surface