[Tagging] Landcover... not again?....!

[Greg Troxel]

I think we should adopt landcover=, to describe what is there, and have
it be entirely separate from landuse.  This is normal geographic
practice and OSM should act like it has some understanding of
professional scholarship.

It is ridiculous to tag natural=grass on an installed and maintained
lawn.  In most places, if you didn't kill everything else and water it,
you'd end up with something else pretty quickly.  Unless we think
natural means "something that is alive", which to me isn't what it means
in en_US and I'm pretty sure not what it means in en_GB.

To deal with existing tagging, we just need to define rules that say

  If there is a natural=grass tag, act like landcover=grass is set.
  Deprecate natural=grass for new tagging, but don't get upset and
  don't expect it to go away.

  Not quite the same for natural=wood.  Have it imply landcover=trees,
  but also mean that the trees are more or less in a natural state.  A
  bunch of planted and maintained trees, e.g. under the direction of a
  landscape architect, is not natural=trees.

  For natural=grassland, probably have it imply landcover=grass, but
  again restrict it to things that happen naturally.
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