Indexing MARC21 653 field

Modified /import/marc.properties and
/module/VuFind/src/VuFind/Recordriver/SolrMarc.php for indexing and
showing 653 subjects

import/marc.properties

@@ -57,7 +57,7 @@ callnumber-subject = custom, getCallNumberSubject(090a:050a), callnumber_subject
 callnumber-subject-code = custom, getCallNumberSubject(090a:050a)
 callnumber-label = custom, getCallNumberLabel(090a:050a)
 
-topic = custom, getAllSubfields(600:610:611:630:650:656, " ")
+topic = custom, getAllSubfields(600:610:611:630:650:653:656, " ")
 genre = custom, getAllSubfields(655, " ")
 geographic = custom, getAllSubfields(651, " ")
 era = custom, getAllSubfields(648, " ")

module/VuFind/src/VuFind/RecordDriver/SolrMarc.php

@@ -127,7 +127,7 @@ class SolrMarc extends SolrDefault
     {
         // These are the fields that may contain subject headings:
         $fields = array(
-            '600', '610', '611', '630', '648', '650', '651', '655', '656'
+            '600', '610', '611', '630', '648', '650', '651', '653', '655', '656'
         );
 
         // This is all the collected data: