[Tagging] layer=-1, rivers, bridges and tunnels

[Richard Mann]

Setting the river to layer=-1, and the bridge to layer=0 (or 1) avoids a
range of rendering artefacts when roads have casings (which they usually
do). Good practice is only applying that to a shortish section of river,
obviously.

I don't know why the wiki has a statement against it - it always seemed
like a unilateral "I don't like it" from Nathan Edgar the second.
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