* improved episode file format detection
* fixed local feed full update resulting in empty feed
* corrected summing and updating of episodes count and total duration of a feed after refresh
* update episodes count and total duration of feeds when episodes are erased
* in Library refresh feeds in a normal volume updates the feeds regardless
* improved/corrected fetch episode size
* turned off fetch media size on refresh
* added setting "Fetch media sizes on refresh" in Settings->Network Storage
