Added (commented out) support for new Summon facets.

config/vufind/Summon.ini

@@ -134,6 +134,8 @@ Discipline = "Subject Area"
 SubjectTerms = Topic
 Language = Language
 PublicationDate = "adv_search_year"  ; share year string w/advanced search page
+;DatabaseName = "Database"
+;SourceName = "Provider"
 
 ; These facets will be shown above search results if the TopFacets recommendations
 ; module is used, as opposed to the [Facets] section, which is shown to the side