* elmo.el (elmo-folder-synchronize): Sort the return value of

* elmo.el (elmo-folder-synchronize): Sort the return value of
`elmo-list-diff'.

* elmo-util.el (elmo-list-diff): Don't care the order of the returned
list.

* test-elmo-util.el (test-elmo-same-list-p): New function.
(test-elmo-same-diff-p): Ditto.
(test-elmo-list-diff): Use it.

* wl-summary.el (wl-summary-sync-update): Sort the return value of
`elmo-list-diff'.