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Spinoff from SOLR-4615, breaking it out here so we can address the changes in pieces.
SOLR-4725 Should we stop supporting "name" and "dataDir" in the autodiscover mode?
SOLR-4615 Take out the possibility of having a solr.properties file
SOLR-4542 Add entries to CHANGES.txt and Wiki for the "obsoleting solr.xml" and "lots of cores"