Place small

Superceeds #538
Fixes #103
Fixes #522

This will reveal two widespread problems in the data
* TIGER import place classifications are awful.
* There are frequently duplicate place areas and place points

There is a very minor performance boost overall to this pull, in spite of adding ``planet_osm_polygon`` which comes from combining some of the MSS.

The MSS could probably be further simplified, but I'll leave that to others.