[Tile-serving] [openstreetmap/osm2pgsql] add flag to process new-style polygons only (#580)

[Sarah Hoffmann]

With this flag set, the logic that checks for tags of outer
rings on multipolygons is disabled and such ways also cannot
be superseded and will always be rendered. Note that for
efficiency reasons we still process polygon ways in the
second stage where we can make use of multiple threads.

This is an experimental change for exploring the effects of old-style multipolygons in the OSM database. I haven't extensively tested yet if it does what it says.
You can view, comment on, or merge this pull request online at:

  https://github.com/openstreetmap/osm2pgsql/pull/580

-- Commit Summary --

  * add flag to process new-style polygons only

-- File Changes --

    M options.cpp (13)
    M options.hpp (1)
    M output-pgsql.cpp (24)
    M tagtransform.cpp (8)
    M tagtransform.hpp (4)

-- Patch Links --

https://github.com/openstreetmap/osm2pgsql/pull/580.patch
https://github.com/openstreetmap/osm2pgsql/pull/580.diff

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