See bug 28999. Separating ColumnSet from AllowList.
Created attachment 124885 [details] [review] Bug 29029: Introduce Koha::Object::ColumnSet
Removed the test temporarily, and the City example. Patch coming.
Created attachment 124897 [details] [review] Bug 29029: Introduce Koha::Object::ColumnSet
Created attachment 124898 [details] [review] Bug 29029: Add tests
Wasting time?