Removed unused "engine" setting (legacy from version 1.x).

config/vufind/config.ini

@@ -341,9 +341,9 @@ searchesBySource = false
 ; single merged list, or separate grouped lists by module (Solr, Summon, etc.)
 recordsBySource = false
 
-; This section requires no changes for most installations
+; This section defines the location/behavior of the Solr index and requires no
+; changes for most installations
 [Index]
-engine          = Solr
 url             = http://localhost:8080/solr
 default_core    = biblio
 ; This setting needs to match the <maxBooleanClauses> setting in your solrconfig.xml