Add JobQueue panel to the show view for BatchJob in the admin interface
Cleanup the layout of the WorkOcrResult migration so easier to read
Changes to Work model

* Fix association for Work having many Pages (missing foreign key since column names are using Rails standards)
* Add numerous scopes to the Work model to replicate queries that are being performed directly from DashboardController
Improve create batch logic in dashboard controller

* The create_batch action now uses ActiveRecord methods to perform queries
* Use the various named scopes from Work model to make queries instead of raw SQL
* Add extensive unit tests that cover the behavior of the DashboardController#create_batch action.