Added missing comments, removed unused property.

module/VuFind/src/VuFind/ILS/Driver/Unicorn.php

@@ -44,12 +44,33 @@ use File_MARC, VuFind\Exception\ILS as ILSException;
  **/
 class Unicorn extends AbstractBase implements \VuFindHttp\HttpServiceAwareInterface
 {
+    /**
+     * Host
+     *
+     * @var string
+     */
     protected $host;
+
+    /**
+     * Port
+     *
+     * @var string
+     */
     protected $port;
+
+    /**
+     * Name of API program
+     *
+     * @var string
+     */
     protected $search_prog;
-    protected $url;
 
-    protected $db;
+    /**
+     * Full URL to API (alternative to host/port/search_prog)
+     *
+     * @var string
+     */
+    protected $url;
 
     /**
      * HTTP service
@@ -114,8 +135,6 @@ class Unicorn extends AbstractBase implements \VuFindHttp\HttpServiceAwareInterf
             $this->port = $this->config['Catalog']['port'];
             $this->search_prog = $this->config['Catalog']['search_prog'];
         }
-
-        $this->db = \VuFind\Connection\Manager::connectToIndex();
     }
 
     /**