[Tilesathome] Marsh Rendering in Osmarender (natural=marsh)

["Marc Schütz"]

> How about we get the natural=marsh tag rendered. Brent Easton had
> an excellent pattern posted at the dev-list[1].
> 
> Attached patch and sample for zoom 17. Patch should apply cleanly
> against r10608.

Committed in rev 10723.

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