DS-1409 add ItemCountDAOSolr, make it default
Throw exception to alert user about *_item_count tables not being used in ItemCountDAOSolr
Make XMLUI aware of webui.strengths.show and turn on caching by default
Allow use of a single Solr query to get the strenghts of all communities and collections
Merge pull request #334 from helix84/DS-1409-ItemCountDAOSolr

DS-1409 add ItemCountDAOSolr, make it default