[Tile-serving] [openstreetmap/osm2pgsql] Prep for changes multistage proc (#1214)

[Jochen Topf]

These are some preparatory commits for a cleanup/fix of multistage processing. See individual commits.
You can view, comment on, or merge this pull request online at:

  https://github.com/openstreetmap/osm2pgsql/pull/1214

-- Commit Summary --

  * Remove stage 2 processing of relations
  * Use osmium::index::IdSetSmall instead of id_tracker in flex output
  * Keep track of name and number of results in prepared_lua_function_t
  * Make tracking/checking of context more obvious

-- File Changes --

    M docs/flex.md (9)
    M src/init.lua (4)
    M src/output-flex.cpp (96)
    M src/output-flex.hpp (66)

-- Patch Links --

https://github.com/openstreetmap/osm2pgsql/pull/1214.patch
https://github.com/openstreetmap/osm2pgsql/pull/1214.diff

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