[Tile-serving] [openstreetmap/osm2pgsql] Check order of input files and warn if they are out of order (#1250)

[Jochen Topf]

Osm2pgsql relies on the order nodes, then ways, then relations for
correct functioning. Future versions will also need ids to be in order
for efficiency and to allow merging and simplification of input files.

This commits adds a warning output when the order is not correct.

See #1167.

@pnorman Can you please review?
You can view, comment on, or merge this pull request online at:

  https://github.com/openstreetmap/osm2pgsql/pull/1250

-- Commit Summary --

  * Check order of input files and warn if they are out of order

-- File Changes --

    M src/CMakeLists.txt (1)
    A src/check-order.cpp (79)
    A src/check-order.hpp (40)
    M src/osmdata.cpp (4)

-- Patch Links --

https://github.com/openstreetmap/osm2pgsql/pull/1250.patch
https://github.com/openstreetmap/osm2pgsql/pull/1250.diff

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