Draft: Add support for encrypting home directories
- adduser: Add --encrypt-home option, which calls ecryptfs-setup-private for the hard work.
- doc/adduser.8: document the --encrypt-home option
- debian/control: suggest ecryptfs-utils >= 67-1
- deluser: remove all of /var/lib/ecryptfs/$user with --remove-home
This aims to complete the work initiated with !70 (closed) by adding tests for the adduser and deluser cases.