BibRank: Solr: better ranking for fulltext by default

 * Ranks fulltext and metadata properly

Signed-off-by: Patrick Glauner <patrick.oliver.glauner@cern.ch>
Solrutils: more accurate ranking scores

 * Ceils ranking scores to avoid anomalies

Signed-off-by: Patrick Glauner <patrick.oliver.glauner@cern.ch>