add a facet to control index consolidation

[MatthewStephens]

Bob H. has asked me to add a released_facet to our Solr XML files to facilitate his moving records from one core to another. We should have values corresponding to the three current indexes in use (DCS core, searchdev, and the production index)

[MatthewStephens]

This has some complex dependencies, at least for testing. development.rb or lib/hydra.rb will need some patching, as the FEDORA_PROXY_URL constant is mentioned, but only defined in production. Hydra also needs a require 'open-uri' added to prevent nokogiri from failing in one place. Indexing scenario objects contain URLs for fedora repositories, and this determines where the XSLT is fetched for building Solr records. I have a working version in dev at the moment, but need to sort out how to commit this to two different git projects.

I think it's best to add an IndexDestination model to TS, in order to store and manage the URLs involved.

[MatthewStephens]

Bibl.find(1005) for testing.