Fix bug in athdir command-line parsing

- A bug prevented athdir from supporting the single-positional-argument
  variation of the first invocation mode (with "type" defaulting to
  "bin").
- Replace list comprehension and contains with any() per achernya's
  suggestion
- Add comments documenting the two invocation modes.
Bump setup.py to 10.4.1.1

It really should be 10.4.1, but I accidentally already tagged
10.4.1.
Merge branch 'master' into debian
Update packaging and release

- Move attach and friends to /bin where they belong (not /usr/bin)
- Provide a bogus zinit so as not to break people using it
- Provide a symlink from nfsid to fsid