Switch to SQLAlchemy Core for OSM objects

osm2pgsql creates tables without primary keys. Some OSM objects are
split into multiple table rows to help with PostGIS index performance.

Adjust the code to be aware of this.

Also add name matching for streets.

matcher/planet.py

@@ -0,0 +1,27 @@
+from sqlalchemy import Table, Column, Integer, String, Float, MetaData
+from sqlalchemy.dialects import postgresql
+from geoalchemy2 import Geometry
+
+metadata = MetaData()
+
+point = Table("planet_osm_point", metadata,
+    Column("osm_id", Integer),
+    Column("name", String),
+    Column("tags", postgresql.HSTORE),
+    Column("way", Geometry("GEOMETRY", srid=4326, spatial_index=True), nullable=False),
+)
+
+line = Table("planet_osm_line", metadata,
+    Column("osm_id", Integer),
+    Column("name", String),
+    Column("tags", postgresql.HSTORE),
+    Column("way", Geometry("GEOMETRY", srid=4326, spatial_index=True), nullable=False),
+)
+
+polygon = Table("planet_osm_polygon", metadata,
+    Column("osm_id", Integer),
+    Column("name", String),
+    Column("tags", postgresql.HSTORE),
+    Column("way", Geometry("GEOMETRY", srid=4326, spatial_index=True), nullable=False),
+    Column("way_area", Float),
+)