[Freeciv-Dev] (PR#11828) patch: partial city update for what-if scenarios

["Benoit Hudson" <bh@xxxxxxxxxxxxxxxxxxx>]

<URL: http://bugs.freeciv.org/Ticket/Display.html?id=11828 >

Here's a patch to do a partial update to the city: if the caller 
knows the production, then we can update the city in half 
the time of a generic_city_refresh.

The patch includes a one-line change to the cm to use the new
function.  The cm.sav.gz in PR#10203 takes 3.8s in the CM rather
than 4.8s on load; and the CM on Boston takes ~.3s rather than ~.7s

city_fast_refresh.diff
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