Improve accessions search bar, fixes #6007

- Add full donors and creators to ES accessions
- Use ES in accessions browse page search with boosted fields
- Add relevance as a sort option

Squashed commit of the following:

commit 8c458c94fb6992b555b105d666f756326720c9d4
Author: José Raddaoui Marín <raddaouimarin@gmail.com>
Date:   Tue Jan 14 18:04:30 2014 +0100

    Fix relevenace sort option

commit 80cdd45f2bd7543a26eb44b21913a07325c98d46
Author: José Raddaoui Marín <raddaouimarin@gmail.com>
Date:   Tue Jan 14 17:33:24 2014 +0100

    Change sort options for browse accessions

    Add relevance options only when querying

commit 94c192f27e6ddc95db3de0bcf818e9044d4a1b08
Author: José Raddaoui Marín <raddaouimarin@gmail.com>
Date:   Tue Jan 14 16:51:28 2014 +0100

    Change query fields in accessions browse page

commit 865688ce60825edf8f618e6d552a77c5fc1e5bc3
Author: José Raddaoui Marín <raddaouimarin@gmail.com>
Date:   Tue Jan 14 16:50:03 2014 +0100

    Add full donors and creators to ES accessions

commit 62a78114dfb680b6d3035dce964e72699d28c2e1
Author: José Raddaoui Marín <raddaouimarin@gmail.com>
Date:   Mon Jan 6 17:54:42 2014 +0100

    Add relevancy as a sort option

    Allows to see the results weighted by field priority

commit f5d2b0240ea498b4581575164c9bd9685b085edf
Author: José Raddaoui Marín <raddaouimarin@gmail.com>
Date:   Sun Dec 29 02:24:11 2013 +0100

    Use ES in accessions browse page

    Add boost options in query fields

commit e899df22dd159d0ac15dda24d7c3d9dab81e564e
Author: José Raddaoui Marín <raddaouimarin@gmail.com>
Date:   Sun Dec 29 01:35:01 2013 +0100

    Add donors name to ES accessions