[Tile-serving] [openstreetmap/osm2pgsql] Make sure PostgreSQL connection is cleaned up properly. (#1013)

[Jochen Topf]

PQfinish(m_conn) must also be called if the connection attempt fails.
By wrapping this into a unique_ptr with deleter, the code becomes
simpler, none of the special member functions is needed any more.

This also adds a little convenience function error_msg() which makes the
rest of the code somewhat cleaner.
You can view, comment on, or merge this pull request online at:

  https://github.com/openstreetmap/osm2pgsql/pull/1013

-- Commit Summary --

  * Make sure PostgreSQL connection is cleaned up properly.

-- File Changes --

    M src/pgsql.cpp (33)
    M src/pgsql.hpp (18)

-- Patch Links --

https://github.com/openstreetmap/osm2pgsql/pull/1013.patch
https://github.com/openstreetmap/osm2pgsql/pull/1013.diff

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