[Freeciv-Dev] (PR#14969) Ressource specials are no longer modified when a terrain is transformed

["Daniel Markstedt" <himasaram@xxxxxxxx>]

<URL: http://bugs.freeciv.org/Ticket/Display.html?id=14969 >

I suggest a compromise on this matter:

Keep the current behavior - specials don't change when terrain is
transformed - _except_ for the case of transformation to/from ocean, in
which case the special is lost.

This way we avoid the most nonsensical combinations such as
forest/whales or ocean/buffalo etc.

-Daniel