improve connection detection heuristic

	my $wait_time

	  = ( $next_journey->{rt_departure}->epoch - $journey->{rt_arrival}->epoch )

	  / 60;

	# Assumption: $next_journey is a missed connection (i.e., if $journey had

	# been on time it would have been an earlier train)

	# * the wait time between arrival and departure is less than 70 minutes

	#   (up to 60 minutes to wait for the next train in an hourly connection

	#    + up to 10 minutes transfer time between platforms)

	# * the delay between scheduled arrival at the interchange station and

	#   real departure of $next_journey (which is hopefully the same as the

	#   total delay at the destination of $next_journey) is more than 120

	#   minutes (-> 50% fare reduction) or it is more than 60 minutes and the

	#   single-journey delay is less than 60 minutes (-> 25% fare reduction)

	#   This ensures that $next_journey is only referenced if the missed

	#   connection makes a difference from a passenger rights point of view --

	#   if $journey itself is already 60 .. 119 minutes delayed and the

	#   delay with the connection to $next_journey is also 60 .. 119 minutes,

	#   including it is not worth the effort. Similarly, if $journey is already

	#   ≥120 minutes delayed, looking for connections and more delay is

	#   pointless.

	if (

		$wait_time < 120

		$wait_time < 70

		and ( $possible_delay >= 120

			or ( $journey->{delay} < 60 and $possible_delay >= 60 ) )

	  )