hangeMaxIter :: (Integer -> Integer) -> AppController -> AppController
changeMaxIter f app = let mi = appMaxIter app in app { appMaxIter = f mi }

changeMaxIter :: (Integer -> Integer) -> AppController -> AppController
changeMaxIter f app = let mi = appMaxIter app in app { appMaxIter = f mi }
changeMaxIter f app = let mi = appMaxIter app in app { appMaxIter = f mi }