[Tile-serving] [openstreetmap/osm2pgsql] Limit the number of scheduled deletes (#1022)

[Sarah Hoffmann]

As we have to issue a delete for each and every untagged node,
the number of scheduled deletes can become quite large even for
a small change file. It is better to send off the copy buffer
a bit earlier in this case to ensure that the deletes can already
run in parallel with the parsing of the file. The change also
ensures that the memory usage of the deleter is bound.
You can view, comment on, or merge this pull request online at:

  https://github.com/openstreetmap/osm2pgsql/pull/1022

-- Commit Summary --

  * Limit the number of scheduled deletes

-- File Changes --

    M src/db-copy-mgr.hpp (2)
    M src/db-copy.hpp (15)
    M src/gazetteer-style.hpp (10)

-- Patch Links --

https://github.com/openstreetmap/osm2pgsql/pull/1022.patch
https://github.com/openstreetmap/osm2pgsql/pull/1022.diff

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