Log.pm: logger() class method now returns CODEREF. Input::Twitter: logger option now takes CODEREF. This interface is more general than passing objects.
t/Util_sort_statuses.t: test is now stricter (now it sorts clone of status arrays to detect in-place modification). Util.pm: sort_statuses() now avoids autovivification of {busybird} field.
xt/Input_Twitter: if the file already exists in the test of filepath option, the test stops rather than unlink the file. This is safer action to take.
StatusStorage::Memory: implement save() and load() methods. Test complete.
Input::Twitter: transform_status_id() now transforms ID into status/show API URL. This makes more sense.
Input::Twitter: implement apiurl option. apiurl is now determined based on (1) apiurl option (2) apiurl() method of the backend (3) {apiurl} field of the backend.