show destination name if set (variable callee_id_name under freeswitch)

show destination name after a successful cidlookup from the local db and public directories (I know this can't be merged to master, but maybe that patch is useful for someone else)

freeswitch example configuration: (conf/dialplan/default/XY.xml)
<include>
  <extension name="lookup-callee-id" continue="true">
    <condition field="destination_number" expression="^(\d{2}\d+)$">
      <action application="export" data="callee_id_name=${cidlookup($1)}" inline="true"/>
      <action application="log" data="INFO callee_id_name is ${callee_id_name}"/>
    </condition>
  </extension>
...
</include>