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

[Sarah Hoffmann]

> @@ -14,26 +14,42 @@
>  
>  struct options_t;
>  
> +/**
> + * @brief object which stores OSM node/ways/relations from the input file

Enable JAVADOC_AUTOBRIEF in the configuration file and remove brief here. autobrief is better readable in the code. Also choose either @-style or /-style.

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