[Freeciv-Dev] (PR#6918) GUI for CMA should allow zero weights

["Benoit Hudson" <bh@xxxxxxxxxxxxxxxxxxx>]

<URL: http://rt.freeciv.org/Ticket/Display.html?id=6918 >

I'm thinking in particular of luxuries.  Luxuries are completely
worthless except at the discrete jumps between riot/content and
content/happy.  If I create 2 more luxuries, but it doesn't change my
city's happiness, I'm wasting possible other things I could make.  The
CM code (in theory, though it doesn't right now) could use a zero weight
to mean it can avoid optimizing along that axis, which can speed things up.

I should note that among the solutions the CM finds that are equal in
fitness according to the weights you give it, the CM returns the one
that has the most total production.  So even with a zero weight on
shields, the CM will choose a grassland+shield square over a grassland
square (for instance).