[Tile-serving] [openstreetmap/osm2pgsql] Options cleanup (#973)

[Jochen Topf]

Cleanup of command line options list.
    
* Use nullptr where applicable
* Use no_argument and required_argument symbols instead of 0/1
* Sort by option name

You can view, comment on, or merge this pull request online at:

  https://github.com/openstreetmap/osm2pgsql/pull/973

-- Commit Summary --

  * Use defalt member initialization in some classes.
  * Update URLs in README.md.
  * Cleanup of command line options list.

-- File Changes --

    M README.md (28)
    M node-persistent-cache.cpp (2)
    M node-persistent-cache.hpp (2)
    M node-ram-cache.cpp (8)
    M node-ram-cache.hpp (38)
    M options.cpp (108)
    M options.hpp (68)

-- Patch Links --

https://github.com/openstreetmap/osm2pgsql/pull/973.patch
https://github.com/openstreetmap/osm2pgsql/pull/973.diff

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