replicate backwards aka return ticket

[Dwachs]

taking up the oldancient discussion from here:

http://forum.simutrans.com/index.php?topic=149.0

I changed the string to 'copy backward' as this fits into the button. Any opinions? 'Replicate backwards' is way too long.

[An_dz]

If it's too long, I want to suggest Mirror stops
And the tooltip for the button could be Adds the same stops but in reverse direction or something like this.

[Fabio]

By the way, there were plans to enable this function to be used also for railways with double tracks. Or was it St-Exp?