Overview of changes:

 *  Relaxed shellfu-bash-jat version range

    xcase and jat don't need to go hand-in-hand, so this is more of a
    burden than advantage.  Especially when jat is still in the stage
    when it needs to move fast.

 *  Codebase maintenance

Overview of changes:

 *  Banned @ from xcase__enum()

    Since case ids now can become part of jats:// ids, it's better to
    allow minimal set and avoid confusion.

 *  Made use of multi-line logging in latest jat.sh

 *  Added case ids to JAT phases

 *  Removed forgotten beakerlib-ism

 *  Codebase maintenance