Boost records from CLARIN Centres in search results

Discuss: add a boost for _harvesterRoot:"CLARIN Centres".

Note: a comment suggestion this is already present in the Solr config:

VLO/vlo-solr/solr-home/vlo-index/solrconfig.xml

Lines 795 to 798 in bd4d1a0

    
                           --> 
        
                           rord(_hierarchyWeight) _hasPartCountWeight^.2  rord(_daysSinceLastSeen)^.05 linear(_resourceAvailabilityScore,.1,0)^.2 
        
                           <!-- TODO: prefer CLARIN records over non-CLARIN? --> 
        
                       </str>

	-->
	rord(_hierarchyWeight) _hasPartCountWeight^.2 rord(_daysSinceLastSeen)^.05 linear(_resourceAvailabilityScore,.1,0)^.2
	<!-- TODO: prefer CLARIN records over non-CLARIN? -->
	</str>