add new nominatim shortcuts

* {{nominatimCoords}}
* {{nominatimBbox}}
* ({{nominatimId}}, formerly {{nominatim}})
Merge branch 'master' into ffs
implement around searches

using the new {{nominatimCoords}} shortcut, producing queries like

  <around {{nominatimCoords:Mycity}} radius="1000"/>

radius is hardcoded to 1000m for now, but adjustable globally.
more test for ffs/wizard