Log Message:
osm2pgsql: update to 0.94.0

Release 0.94.0, a new stable branch
This is the last release which will support old-style
multipolygons.

Upgrading to this version requires a reimport for the slim
table changes.

Major changes since 0.92.0 are

- Coordinates are now stored unprojected in slim tables, and an
  osmium dense file array is used for flat nodes. This dense
  file array can be read by other libosmium-based programs.

- Libosmium is used for geometry building instead of GEOS

  This offers speed increases, improves code, and avoids relying
  on a large library for a small portion of its functionality.

Other changes are

- Tile expiry has been rewritten, fixing bugs, including one
  that dropped large portions of expiry lists.

- Node tags are no longer stored in slim tables, consistent with
  flat-nodes. THis reduces space required for --slim imports
  without --flat-nodes.

- A default database name of gis is no longer assumed. An
  explicit -d option is recommended if compatibility with 0.92
  and earlier.