[Tile-serving] [osm2pgsql] Add basic Doxygen framework and convert some comments (#410)

[Paul Norman]

A previous contributor wrote doxygen-formatted comments anyways, so doxygen generates more than I had expected.
You can view, comment on, or merge this pull request online at:

  https://github.com/openstreetmap/osm2pgsql/pull/410

-- Commit Summary --

  * Add basic Doxygen framework and convert some comments

-- File Changes --

    M .gitignore (4)
    M CONTRIBUTING.md (9)
    A docs/Doxyfile (2362)
    M middle.hpp (26)
    M options.hpp (64)

-- Patch Links --

https://github.com/openstreetmap/osm2pgsql/pull/410.patch
https://github.com/openstreetmap/osm2pgsql/pull/410.diff

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Reply to this email directly or view it on GitHub:
https://github.com/openstreetmap/osm2pgsql/pull/410
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