1.6.2

[1.6.2]

Added

• The sample generation command now logs stdout, stderr, and cmd.sh to merlin_info/.
• 12 hidden test specs and associated cli tests, for cli tests with specs that we
  do not want in merlin examples.
• Inside merlin_info/, added provenance specs <name>.orig.yaml, <name>.expanded.yaml, and
  <name>.partial.yaml (identical to the original spec, but with expanded user variables).

Fixed

• Updated to new celery (4.4.5) syntax for signature return codes.
• Corrected prior visibility timeout bugfix.
• Fixed and reactivated 3 cli tests.
• Added the bank and walltime keywords to the batch slurm launch, these
  will not alter the lsf launch.

Changed

• Slightly improved logic by using regex to match variable tokens.
• Reduced instances of I/O, MerlinStudy logic is now in-memory to a greater extent.