[Tile-serving] [openstreetmap/osm2pgsql] Middle refactorings and tests (#1110)

[Jochen Topf]

Various refactoring and tests for the middle code. See individual commits for details.
You can view, comment on, or merge this pull request online at:

  https://github.com/openstreetmap/osm2pgsql/pull/1110

-- Commit Summary --

  * Clean up middle test code
  * Add test for adding/deleting/changing way in middle
  * Add remove() function to node_ram_cache
  * Clean up flat node file after middle tests
  * Add default constructor for node_ram_cache for testing
  * read_location() helper only needs a const reference to the cache
  * Add tests for adding, changing and removing nodes in middle
  * Simplify test code
  * Refactor test_buffer_t in middle test
  * Add asserts() in middle-pgsql to expose assumptions the code makes

-- File Changes --

    M src/middle-pgsql.cpp (12)
    M src/node-ram-cache.cpp (13)
    M src/node-ram-cache.hpp (13)
    M src/osmtypes.hpp (2)
    M tests/common-cleanup.hpp (12)
    M tests/test-middle.cpp (259)
    M tests/test-persistent-cache.cpp (6)
    M tests/test-ram-cache.cpp (41)

-- Patch Links --

https://github.com/openstreetmap/osm2pgsql/pull/1110.patch
https://github.com/openstreetmap/osm2pgsql/pull/1110.diff

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