Document Integral Curves

[rusu24edward]

Update/create documentation on integral curves.

[rusu24edward]

"Go to the Source section on the Integration tab." in https://visit-sphinx-github-user-manual.readthedocs.io/en/develop/tutorials/Aneurysm.html#visualizing-the-velocity-vector-field doesn't make sense because source is now its own tab

Same thing for Potential flow

The images need to be updated too, so I made #4587 to track this.

[rusu24edward]

• Sampling along and sampling type should be on different lines in the integral curve operator attributes.
  

[rusu24edward]

• Add sphinx docs for https://www.visitusers.org/index.php?title=Parallel_Integral_Curve_System_in_VisIt

[rusu24edward]

• Under source->field->flash, it is not clear what the velocity property does.

Trying this on aneurysm, by selecting Flash and leaving default options, I get this error:

Pseudocolor:  ()
viewer: The pipeline object is being used improperly: No initial interval tree

[rusu24edward]

• Is NIMROD still a future implementation? (source->field)

I emailed Allen about this. It has not been implemented yet.

[rusu24edward]

• Not really clear what is bounding box absolute tolerance for the integrator.
• What is Adams-Bashforth and MD3-C1 tolerance? Is it just a clip on the step length?

[rusu24edward]

• Under advanced, warnings, why would we issue a warning when the maximum number of steps is reached?

Edit: this makes sense for LCS, Limit Cycle, and Poincare because they use analysis for determining when the integration is done. So it could be good to see a warning saying "We did not find a limit cycle before max number of steps reached." However, with a normal ICO, we don't want this warning because the only thing that stops the integration is the maximum number of steps.

[rusu24edward]

• Remove details of stiffness warning from the gui and add to the docs.

[rusu24edward]

• What is speed cutoff for critical points?

[rusu24edward]

• Add images from visit users to the new docs. Images of the gui itself should be retaken because they are outdated.