SVK::Editor::Patch - An editor to serialize editor calls.

    $patch = SVK::Editor::Patch->new...
    # feed things to $patch
    $patch->drive ($editor);

SVK::Editor::Patch serializes incoming editor calls in a tree structure. $editor-{edit_tree}> is an array indexed by the baton id of directories. The value of each entry is an array of editor calls that have baton id as parent directory. Each entry of editor calls is an array with the first element being the child baton id (if any), and then the method name and its arguments.