Handle the junction=intersection tag in OSM, representing a short "road"

in the interior of a big intersection. #255, #114

- No sidewalks or parking on it
- Automatically try to merge it

Bring in fresh Seattle OSM with a few places on Aurora tagged, for
further experimentation.

Also, there's some bug in the importer; Seattle maps didn't get
regenerated last change. Picking up the diffs now.

convert_osm/src/extract.rs

@@ -478,7 +478,7 @@ fn is_road(tags: &mut Tags, opts: &Options) -> bool {
     if !tags.contains_key(osm::SIDEWALK) && opts.map_config.inferred_sidewalks {
         tags.insert(osm::INFERRED_SIDEWALKS, "true");
         if tags.is_any(osm::HIGHWAY, vec!["motorway", "motorway_link"])
-            || tags.is("junction", "roundabout")
+            || tags.is_any("junction", vec!["intersection", "roundabout"])
             || tags.is("foot", "no")
             || tags.is(osm::HIGHWAY, "service")
         {

convert_osm/src/parking.rs

@@ -110,6 +110,10 @@ fn use_parking_hints(map: &mut RawMap, path: String, timer: &mut Timer) {
             if !fwds && tags.is("dual_carriageway", "yes") {
                 continue;
             }
+            // And definitely no parking in the middle of an intersection
+            if tags.is("junction", "intersection") {
+                continue;
+            }
 
             if let Some(both) = tags.remove(osm::PARKING_BOTH) {
                 tags.insert(osm::PARKING_LEFT, both.clone());