Renamed Instance related code
Fixed merge conflicts:
	app/models/concerns/manifest.rb
	app/models/work.rb
Merge branch 'master' of https://github.com/Det-Kongelige-Bibliotek/valhal
Removed more reps
Fixed merge conflicts:
	app/helpers/authority_metadata_unit_helper.rb
	spec/helpers/digitisation_helper_spec.rb
Fixed merge conflicts:
	app/helpers/authority_metadata_unit_helper.rb
	spec/helpers/digitisation_helper_spec.rb
Fixed merge conflicts:
	app/controllers/works_controller.rb
	app/views/works/show.html.erb
	spec/helpers/digitisation_helper_spec.rb
	spec/helpers/manifestations_helper_spec.rb