[Freeciv-Dev] activeunits patch

["Daniel Speyer" <Daniel_Speyer@xxxxxxxxxxxxxxxxxxxxx>]

I hope I've squeezed this in before feature freeze takes effect :).

It's basically the same patch i submitted previously (which got ignored)
but with the memory leak fixed and a small improvement on the find-nearest
feature (it uses the little yellow arrows now).  I hope this can get into
1.12.0

Feal free to contact me with any issues etc.

Thanks in advance
--Daniel Speyer
"May the /src be with you, always"

activeunits.patch
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