[Freeciv-Dev] (PR#8718) another bug with ocean cities

["Jason Short" <jdorje@xxxxxxxxxxxxxxxxxxxxx>]

<URL: http://rt.freeciv.org/Ticket/Display.html?id=8718 >

When transforming land to ocean, we should allow units to be moved to 
nearby cities as well as nearby land.  These cities may be in the ocean, 
of course.  It may be necessary to check if the unit is F_MARINES.

In both cases however if there is already a city here we need not move 
units at all.  Of course rules elsewhere probably prevent transforming 
tiles with cities on them into ocean.

jason