Added support for top recommendations in collection module.

config/vufind/Collection.ini

 ; This file controls the Collection module (the page accessed by viewing a record
 ; which is a collection).
 
+; These settings control the top and side recommendations (see searches.ini for
+; details on recommendation modules).
+[Recommend]
+;top[] = "PubDateVisAjax:true:publishDate"
+
 ; These settings control which fields are available to sort on in the Collection
 ; module.
 [Sort]

module/VuFind/src/VuFind/RecordTab/CollectionList.php

@@ -87,6 +87,7 @@ class CollectionList extends AbstractBase
             $this->results->getParams()->initFromRecordDriver(
                 $this->getRecordDriver(), $params
             );
+            $this->results->getParams()->recommendationsEnabled(true);
             $this->processed = true;
         }
         return $this->results;

module/VuFind/src/VuFind/Search/SolrCollection/Params.php

@@ -118,7 +118,10 @@ class Params extends \VuFind\Search\Solr\Params
      */
     protected function getRecommendationSettings()
     {
-        // Disabled for now
-        return array();
+        // Collection recommendations
+        $searchSettings = \VuFind\Config\Reader::getConfig('Collection');
+        return isset($searchSettings->Recommend)
+            ? $searchSettings->Recommend->toArray()
+            : array();
     }
 }
\ No newline at end of file