so that tfkit can now be tracked in separate repo.  (In future we might
add it as submodule)

Support test folder structure where test, oracle and generated result
data are stored each in separate directory.  This makes it easier to
ensure legible diff output without cluttering the filenames too much.

This new hierarchy makes it easier to work simultaneously on data and
the script, simplifies deployment to tempdir and makes the launching
script naming consistent with simple.sh.

 *  Enable running all tests via make,
 *  simplify tests (lay off data/tmpdir manipulation to framework),
 *  set rules for naming, exit statuses, etc,
 *  remove beakerlib dependency.

 *  Split into functions as appropriate;
 *  add docstrings;
 *  reduce redundancy;
 *  run everything in C locale (=> update oracles),
 *  add subtest boundaries to output.