Add parameter 'pagelabel' to map query

This commit adds the parameter 'pagelabel' to the map query. If set to
true, it will add an InlineLabel containing a link to the result page
to each marker label. For an example, see:
http://ec2-46-137-28-172.eu-west-1.compute.amazonaws.com/wiki/index.php/Semantic_Maps_-_Labels

Change-Id: I8963b7337534fd8c1b84c6073da39bb7e07f4d8a