Add the demo for good order

demo/main.cpp

@@ -8,6 +8,7 @@
 
 #include "main.h"
 #include "lodepng.h"
+#include "../src/atomorph.h"
 
 MORPH_OPTIONS options;
 

demo/main.h

@@ -3,7 +3,7 @@
  * See Copyright Notice at the end of this file.
  */
 
-#include "../atomorph.h"
+#include "../src/atomorph.h"
 #include "options.h"
 
 bool init        (int argc, char **argv);