* mln/transform/fft.hh
	(internal::_fft<T>::transformed_image() const): Return a const
	reference instead of a copy.
	(internal::_fft<T>::transformed_image_clipped_magn(double, bool)):
	Drop the const before the first argument.
	Properly initialize `max'.
	(internal::_fft<T>::transformed_image_log_magn(double, double, bool)):
	Properly initialize `max'.