Changed superorder and added superorder_display
Changed title_display: Only display "Bd. " if volume_count is trivial (<= 3 chars)
Renamed test_signatures to test_signature
Added ht_number test
Added volume_count_sort
Renamed test_title to test_title_display (not working till test refactoring)
Mayor test refactoring
Added short_title_display (for usage as title in details view)
Changed short_title_display
Blank pseudo volume count such as <Dokumente>
Added secondary form relation to primary form (field '021')
Added secondary_form stuff
Extended test_helper to handle multi field values and JSON objects
Added secondary_form related tests
Added test for relation field
Changed relations to { ht_number: ..., label: ... }
Added secondary_form superorders to superorders field
Changed secondary_form fields
Made tests selectable by TESTS environment variable (TESTS="relation superorder" rake)
Changed tests from secondary_form_note to secondary_form_preliminary_phrase