update search form to use FieldList instead of FieldSet
update search form to use FieldList instead of FieldSet

nyeholt/silverstripe-solr,nyeholt/silverstripe-solr,stephenmcm/silverstripe-solr,stephenmcm/silverstripe-solr,stephenmcm/silverstripe-solr,stephenmcm/silverstripe-solr,nyeholt/silverstripe-solr,nyeholt/silverstripe-solr