Updated City View dialog

Hi,

I've made some more updates to the city view dialog and it
is now about 3/4 functional.

The present and supported units now display correctly.  I
was thinking that there could be more overlap between these
displays and the unit stack panel.  They could use almost
the same component, although there is no real need to have a
unit "in focus" in the city display.

Remaining on the city view are the worklists, the map and a
few other things, like a unit list and the ability to
convert citizens into specialists and vice versa.

I was thinking of working on the map next, unless there is a
reason I should hold off.  Brian, I notice a few comments
about "city mode" in the map sources, so if you have any
ideas I'd like to hear them.

Ben Mazur