Fix issue 483 : Saving layers/anim as non-GIF saves only layer/frame 0. Now with anim it asks confirm then saves current frame, and for layers it allows saving current layer or flattened copy.

git-svn-id: svn://pulkomandy.tk/GrafX2/trunk@1950 416bcca6-2ee7-4201-b75f-2eb2f807beb1

src/buttons.c

@@ -3493,7 +3493,7 @@ void Button_Save(void)
   Save_picture(1);
 }
 
-
+/// Save main image over existing file (no fileselector)
 void Button_Autosave(void)
 {
   byte old_cursor_shape;