Post processing output upgrade

[mbkuhn]

Summary

Following on from a usability request from the last user meeting, this PR introduces a common approach to determine when postprocessing should be output and introduces new features (delay, time-based output, etc.)

Pull request type

Please check the type of change introduced:

• Bugfix
• Feature
• Code style update (formatting, renaming)
• Refactoring (no functional changes, no api changes)
• Build related changes
• Documentation content changes
• Other (please describe):

Checklist

The following is included:

• new unit-test(s)
• new regression test(s)
• documentation for new capability

This PR was tested by running:

• the unit tests
  • on GPU
  • on CPU
• the regression tests
  • on GPU
  • on CPU

Additional background

Issue Number:

[mbkuhn]

Still need to set up the functionality to limit the timestep size, but that should follow after #1542.

Other things to figure out include how to interact with the time tolerances from other outputs (checkpoint and plotfiles).

[mbkuhn]

Also, I'm wondering if this would be a good PR to move non-sampling outputs (KineticEnergy, Enstrophy, etc.) out of the sampling/ directory.

[mbkuhn]

Still need to set up the functionality to limit the timestep size, but that should follow after #1542.

Other things to figure out include how to interact with the time tolerances from other outputs (checkpoint and plotfiles).

Both are in there now. Needs some manual testing and unit testing. And documentation.

[mbkuhn]

Also, I'm wondering if this would be a good PR to move non-sampling outputs (KineticEnergy, Enstrophy, etc.) out of the sampling/ directory.

probably would be too confusing to do this here

[mbkuhn]

need to also have it output at the end of a simulation!!