Ignore SIGPIPE.
Fixed(?) bug in hash queue code when a queued torrent got
deleted. Also reorganized core::Manager to catch all
torrent::local_error's.
Fixed display bug in display::FileList which hid the last element.
git-svn-id: svn://rakshasa.no/libtorrent/trunk/rtorrent@441 e378c898-3ddf-0310-93e7-cc216c733640