[PATCH] Use a different image for the map markers

[Henrik Brautaset Aronsen]

Lubomir I. Ivanov wrote:
> This patch adds the same map marker used in GoogleMaps.
> It also removes the red dots under the marker.
>
> The previous flag.png file had JPEG compressions artifacts
> and also was broken when trying to be loaded on Windows.
> Perhaps a corrupted header or some sort of a backend issue.

What, you didn't like my hand crafted dive flag?  Those aren't jpeg 
artifacts, but a nice "natural" touch by yours truly :)

I intentionally left the red dot there as well, by the way...  Anyway, 
I'll try to figure out the png issue.

Henrik