Clean up some experiments

- remove SOLR_SERVER_INFO
- only allow site to be 'hub'
- only allow dismax queries (and therefore drop the free text query
  parsing code)
- add some sort mappings
refactor data code about whether to include particular fields

looking at source and language stuff
Turn DEBUG off in production
add joomla downloads
update images from production
Merge branch 'production'

* production:
  update images from production
  add joomla downloads
  Turn DEBUG off in production