- Made special exclusion-handling of '.' work in -R mode (so that we

  can't accidentally lose the '.' dir and not transfer anything at all).
- Add a trailing '.' onto all '/'-trailing names, even '/' (fixes
  skipped deletions in -R mode from '/').
- Fixed loss of FLAG_DELETE on user-specified dir when unduplicating '.'
  (could happen on "./." or similar).