hafas-m: document new -m / --mot behaviour

=item B<-m>, B<--mot> I<motlist>

Comma-separated list of modes of transport to show/hide.  Accepts the following

arguments:

	ice    InterCity Express trains

	ic_ec  InterCity / EuroCity trains

	d      InterRegio and similar

	nv     "Nahverkehr", RegionalExpress and such

	s      S-Bahn

	bus

	ferry

	u      U-Bahn

	tram

You can prefix an argument with "!" to hide it.  The default is C<<

ice,ic_ec,d,nv,s >>.  Note that B<-m> does not replace the default, so if you

only want to see S-Bahn and U-Bahn departures, you'd have to use C<< -m

!ice,!ic_ec,!d,!nv,u >>.

By default, B<hafas-m> shows all modes of transport arriving/departing at the

specified station. With I<motlist>, it is possible to either exclude a list of

modes, or exclusively show only a select list of modes.

To exclude modes, set I<motlist> to B<!>I<mot1>,B<!>I<mot2>,...

To show them exclusively, set I<motlist> to I<mot1>,I<mot2>,...

The I<mot> types depend on the used service. Use C<< -m help >> to list them.

=item B<-t>, B<--time> I<hh>:I<mm>