- Incremental recursion mode does not process the dirs while scanning a

- Incremental recursion mode does not process the dirs while scanning a
  file list's contents.  Instead, it handles a parent dir prior to each
  extra file list.  This makes the dir-processing order the same in
  protocol 30 as it is in earlier protocols.
- Moved the permission-fudging code for dirs into recv_generator() to
  make the new protocol-30 dir-handling logic easier.