(1) Add a new error message if the sort order is unexisting
(2) Remove the default sort order to 'asc' if the specified sort order is unknown
(3) Fix an issue with the attributes values boosting parameter that was leading to a 314 error message
(4) use the geofilt function instead of the older frange + hsin functions
(5) When generating the URIs for the aggregates and suggestions, we now create permanent URIs based on their content and not the microtime()