A command prefix to be invoked when search result become available.
The default setting, active when nothing was specified on object creation, is to print
the result (see below) to stdout. The result of the command prefix is
ignored. Errors thrown by the command prefix are caught and cause the invokation of
the error callback (see option -error below), with the error message as argument.
The signature of the command prefix is:
- $cmdprefix result
- The result is a list of dictionaries, containing one item per hit.
Each dictionary will have the following entries: - 
- place_id
- The place ID (FIXME: what's this?) 
- licence
- The data licence string 
- osm_type
- The OSM type of the location 
- osm_id
- FIXME 
- boundingbox
- The coordinates of the bounding box (min and max latitude, min and max longitude) 
- lat
- The location's latitude 
- lon
- The location's longitude 
- display_name
- the location's human readable name 
- class
- FIXME 
- type
- FIXME 
- icon
- FIXME