[Freeciv-Dev] (PR#8627) best overview for iso-maps

["Marcelo Burda" <mburda@xxxxxxxxx>]

<URL: http://rt.freeciv.org/Ticket/Display.html?id=8627 >

Hi
I was exasperated by the shape of overview in iso-maps. the overview is
in native coordinated and this compress x axes. this litle patch make
the overview in natural coordinates.
the way i am choiced is the simplest one. basicaly  i make 
OVERVIEW_TILE_WIDTH *=2; and a litle correction.
the final shape is really best.
but is not perfect! i use rectangular tiles, to make a perfect overview
we need use squared rotate 45°. but this is not good for the overview!

Marcelo

overview_tuning.diff
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