Fix ordering of classification groups.
Move review_done action button out of dropdown menu if available.
Redirect to next case to review after signing.

Conflicts:

	app/controllers/cases_controller.rb
No need to specify case_path() for redirect_to if param is a Case.
Add nice flash messages in review_done action.
Unify "next_case" action for review_done end sign.
Move #review_done logic from controller to model.
Unify second_entry_update action with sign.
Better flash message if there are now more cases in the queue for sign and review_done actions.
Move #sign logic from controller to model.
Fix direct signing in second_entry.
Update CHANGELOG.