(svn r75) -Add proper crediting to graphics artists to about box.

-Change DEBUG lvl for GRF warnings/errors to 2, lvl 1 is used for copyright notices
-Fix show currect filename when debugging grf files

main_gui.c

@@ -1854,7 +1854,7 @@ static void ScenEditToolbarWndProc(Window *w, WindowEvent *e)
 		DrawStringCentered(298, 6, STR_00AF, 0);
 
 		SET_DPARAM16(0, _date);
-		DrawStringCentered(161, 1, STR_0221_TRANSPORT_TYCOON, 0);
+		DrawStringCentered(161, 1, STR_0221_OPENTTD, 0);
 		DrawStringCentered(161, 11,STR_0222_SCENARIO_EDITOR, 0);
 
 		break;