[Tile-serving] [openstreetmap/osm2pgsql] Add option to always build id index (PR #1894)

[Jochen Topf]

If the user always needs the id index, they can force the index build even in non-slim (or slim+drop) mode by setting the `create_index` option of the `ids` setting in the define_table() Lua command to `always`. The default is `autpo` which means: Only build the index in slim mode.

See #1854

The test runner (`steps_db.py`) has been extended so that the table_exists() check also checks for views, so that we can access the data in the `pg_catalog.pg_indexes` view.
You can view, comment on, or merge this pull request online at:

  https://github.com/openstreetmap/osm2pgsql/pull/1894

-- Commit Summary --

  * Use several lua_pop()s to clean up stack instead of one
  * Add option to always build id index

-- File Changes --

    M src/flex-table.cpp (3)
    M src/flex-table.hpp (13)
    M src/output-flex.cpp (20)
    M tests/bdd/flex/lua-index-definitions.feature (61)
    M tests/bdd/steps/steps_db.py (6)

-- Patch Links --

https://github.com/openstreetmap/osm2pgsql/pull/1894.patch
https://github.com/openstreetmap/osm2pgsql/pull/1894.diff

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