Fix Mini-Roundabouts

[jharpster]

The goal of this task is to model min-roundabouts consistent with the Australian tagging guidelines.

This overpass query will identify nodes tagged as mini-roundabouts.
https://overpass-turbo.eu/s/tUh.

Suggested Process:

• Open over-pass turbo and use script listed above.
• Click at the point and click at Node link to open new tab with feature that needs to be edited
• Edit data in either JOSM/ID Editor (iD is recommended for this task)
• Delete highway:mini_roundabout tag from junction using
  button
• Use right click at the node in the middle of junction
  
• Use Split function from contextual menu by clicking at
  button
• Right click at the same node again and use Disconnect function by clicking at
  button
• Now make some empty space for new roundabout like it is presented here:
  
• Begin inserting the circular features by mapping simple rectangle:
  
• Right click at the way of that new rectangle (click in the middle of two nodes) and use Circularize function by clicking
  
  button
• If necessary, move roundabout to center it with imagery (
  
  icon from contextual menu) and adding correct tag to geometry:
• highway=*
• junction=roundabout
• Each entry and exit way should join the roundabout at a separate node.
• surface=* (where possible from Aerial Imagery)
• name=* (IF there is a name specific to the junction add)
• maxspeed=* (If possible from a corroborating source, if not leave it)
• No need to add oneway=yes tag, as this is implied by the junction=roundabout tag. IF you are drawing roundabout from left to right. If you don’t, you have to put oneway tag.
• Sources to check: Aerial Imagery, GPS tracks, Strava

[FrakGart]

Need to also fix any admin boundaries (also routes etc) that were using the highway ways.

eg: Don't do this:
http://www.openstreetmap.org/changeset/54848378