[Tile-serving] [osm2pgsql] Allow method of specifying custom partial indexes (#166)

[Paul Norman]

It would be useful to be able to specify a list of custom indexes, which could be created at import time. This would require a few things

* A syntax for specifying the index, predicate, and where clauses
* An overhaul of the existing index creation code, probably creating all indexes like the custom indexes
* Limiting the parallelism during index creations, either to ``--number-processes`` or a different value, to account for the case where the database has different parallelism than the osm2pgsql machine.
  * Indexes on _ways, _polygon and _line should be created first, in that order, for job scheduling reasons.

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Reply to this email directly or view it on GitHub:
https://github.com/openstreetmap/osm2pgsql/issues/166
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