[Tile-serving] [osm2pgsql-dev/osm2pgsql] Add grouped-linemerge generalization (PR #2482)

[Jochen Topf]

joto left a comment (osm2pgsql-dev/osm2pgsql#2482)

I have run some tests adapting your code for merging boundaries. This was still based on the version with the C++ code but I had to work around a limitation in that. Having this completly in Lua code is opening up some more possibilities.

My tests are based on [this code](https://github.com/osm2pgsql-dev/osm2pgsql-themepark/blob/master/themes/shortbread_v1_gen/topics/boundaries.lua) which re-computes all merged boundaries for the whole planet whenever there is a change. I have successfully used your code to do the same thing incrementally! There are other use cases, not just streets or boundaries. I am also thinking about waterways, railway lines, etc.

The question now is how to make this best re-usable, in a simple but flexible way. With the boundaries I need to get the minimal admin_level from all relations using a way. Currently I am updating this after the merging, but it would be better if we can do this on the fly. Needs some more thinking and exerimenting.

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