Fix table plugin losing the drag handle upon getContents() of the editab...

...le (e.g. in smart content change).

To fix this, the makeClean() method does not deactivate the tables in the given DOM structure any more, because this would unblockify the table in the editable.
Instead, aloha/ephemera is used to mark all DOM elements, classes and attributes that are added to the table for making it editable.