Test..StatusStorage: add more tests to test_status_order
Test..StatusStorage: add tests: changes done to statuses obtained by get_statuses() or inserted/updated by put_statuses() methods should not affect the statuses in the storage.
StatusStorage::Memory: input/output statuses are now cloned. Pass the tests.
StatusStorage::Memory: delete_statuses(timeline => $tl, ids => undef) now deletes the container at all instead of replacing it with an empty one.
Test..StatusStorage: completed test_status_order().