[Tilesathome] New waterway rendering

["Marc Schütz"]

> Looks good to me. For the minimum / maximum width I used a factor 10
> less / more than the default width. You used different limits in
> z12-z14. Any particular reason for your choice?
> 

That wasn't obvious to me, so I simply double each value relative to the next higher zoom level.

BTW, is there a reason why the width-scale-factor attribute is not utilized (i.e. always =1)?

Regards, Marc

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