Should not be needed here as this is not directly used for information
which should impact permissions.
Been through uses to ensure that this is the case.
- Renamed AssignSortSetCommand to AssignSortRuleCommand, updated
contents and testing.
- Updated sorting operations to not update timestamps if only priority
is changed.
- Changes to a sort set will now auto-apply to assinged books (basic
chunck through all on save).
- Added book count indicator to sort set list items.
- Deletion now has confirmation and auto-handling of assigned
books/settings.
