Delete unused image files

pics/ITAClasses.dot

-digraph G {
-center = 1;
-size="15,15";
-rankdir=LR;
-1 [ label = "@itaAudio" ];
-2 [ label = "@itaCoordinates" ];
-3 [ label = "@itaMeta" ];
-4 [ label = "@itaResult" ];
-5 [ label = "@itaSuper" ];
-6 [ label = "@itaValue" ];
-1 -> 5 ;
-4 -> 5 ;
-5 -> 3 ;
-}
\ No newline at end of file