Kjeller: add details to Havretoppen and improve road positions

Kjeller: add roundabout entry/exit that exists, but doesn't go anywhere

Kjeller: add short section of minor power line

Kjeller: improve extent of construction landuse

Kjeller: extend residential landuse to include new construction

Kjeller: use the provisional N50 building geometry where it appears to be better than existing data

Kjeller: add bench and waste basket, and fix position of existing bench

Kjeller: improve Havretoppen a bit where it has started to open, including new noise barrier and access road

Blefjell: add a new path found through N50, with geometry drawn from NiB. Improve some related streams and add bridge+layer tags to fix warnings about crossing path/waterway

Specify whether there are cycleways

Specify path surfaces

Specify whether roads have sidewalks

Add name to lake

Improvements to streams and lakes

Minor adjustment to river crossing based on Kartverket DSM

Move BRE8 to the path added in changeset 123764583 and remove the old intersection since that fits better with both N50 and Strava. Deleted path also had a fixme, so no reason to assume it all three exist.

Mark building construction as finished

Fix overlapping trail and lake, plus general trail improvements

Attempt to clean up trail intersection a bit, and detach guidepost node from the trails

Improve streams and lakes a bit near the trail from Sognefjellshytta