[Tile-serving] [openstreetmap/osm2pgsql] Readme URL updates (#972)

[Jochen Topf]

* Use https where possible
* Fix broken URLs
You can view, comment on, or merge this pull request online at:

  https://github.com/openstreetmap/osm2pgsql/pull/972

-- Commit Summary --

  * Use defalt member initialization in some classes.
  * Update URLs in README.md.

-- 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 (20)
    M options.hpp (68)

-- Patch Links --

https://github.com/openstreetmap/osm2pgsql/pull/972.patch
https://github.com/openstreetmap/osm2pgsql/pull/972.diff

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