[Tile-serving] [openstreetmap/osm2pgsql] Make -G / --multi-geometry option default (#660)

[Darafei Praliaskouski]

For linear features there is an automated split-up based on feature length. This split is enabled unconditionally.

https://github.com/openstreetmap/osm2pgsql/blob/95a3a2036aa6c45698378e5b7b6643d9a7a276b1/geometry-builder.cpp#L293

Polygon split could be implemented in a similar way: if bounding box is wide (probably wider than 180 degrees), split up the rightmost part into a second part, until it grows up to being 180 degrees wide. This way Russia/Alaska will be split into two parts not affecting performance in Europe, but labeling for then would become much better.

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