[Tile-serving] [openstreetmap/osm2pgsql] Fix threading problem flex table (#1081)

[Jochen Topf]

Fixes problem where several threads were using the same db connection objects.

Fixes #1080 
You can view, comment on, or merge this pull request online at:

  https://github.com/openstreetmap/osm2pgsql/pull/1081

-- Commit Summary --

  * Move everything related to copy_gr out of the flex_table_t class
  * Clone flex_table_t objects when cloning the flex_output
  * Clean up code related to database connection handling

-- File Changes --

    M src/flex-table.cpp (27)
    M src/flex-table.hpp (52)
    M src/output-flex.cpp (65)
    M src/output-flex.hpp (9)

-- Patch Links --

https://github.com/openstreetmap/osm2pgsql/pull/1081.patch
https://github.com/openstreetmap/osm2pgsql/pull/1081.diff

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