1.8.0

Added

• retry_delay field in a step to specify a countdown in seconds prior to running a
  restart or retry.
• New merlin example restart_delay that demonstrates usage of this feature.
• Condition failure reporting, to give greater insight into what caused test failure.
• New fields in config file: celery.omit_queue_tag and celery.queue_tag, for
  users who wish to have complete control over their queue names. This is a feature
  of the task priority change.

Changed

• feature_demo now uses merlin-spellbook instead of its own scripts.
• Removed the --mpi=none srun default launch argument. This can be added by
  setting the launch_args argument in the batch section in the spec.
• Merlin CI is now handled by Github Actions.
• Certain tests and source code have been refactored to abide by Flake8 conventions.
• Reorganized the tests module. Made unit dir alongside integration dir. Decomposed
  run_tests.py into 3 files with distinct responsibilities. Renamed Condition classes.
  Grouped cli tests by sub-category for easier developer interpretation.
• Lowered the command line test log level to "ERROR" to reduce spam in --verbose mode.
• Now prioritizing workflow tasks over task-expansion tasks, enabling improved
  scalability and server stability.
• Flake8 examination slightly modified for more generous cyclomatic complexity.
  • Certain tests and source code have been refactored to abide by Flake8 conventions.
• walltime can be specified in any of hours:minutes:seconds, minutes:seconds or
  seconds format and will be correctly translated for the right batch system syntax

Fixed

• For Celery calls, explictly wrapped queue string in quotes for robustness. This fixes
  a bug that occurred on tsch but not bash in which square brackets in the queue name were
  misinterpreted and caused the command to break.