Refine Search algorithm on RDA to improve search results:
- much greater search ranking for title matches
- greater search ranking for keywords within a smaller radius in descriptions
- reduce search ranking for keyword matches in fulltext/descriptions
- greater search ranking for bigrams & trigrams (multi-word phrases)
- added a small boost for highly-connected records
Minor cleanup of commented boost queries
Merge pull request #12 from au-research/search_optimisation

Refine Search algorithm on RDA to improve search results