UPDATE 2-Ryanair cuts profit forecast again as fares tumble
* Cuts profit forecast to 510 mln eur from 570 mln * Says fares to fall around 10 percent in winter * All seats to be allocated in big change to low-cost model By Conor Humphries DUBLIN, Nov 4 (Reuters) - Ryanair's annual profit is set to fall for the first time in five ye
