Parallel work to expand usefulness of parallel tag

[joshua-cogliati-inl]

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Pull Request Description

What issue does this change request address?

Closes #204

What are the significant changes in functionality due to this change request?

Expands the parallel tag to allow more features.
Adds a way to just run HERON with an integration test
Adds different defaults for parallel inner and outer size.

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For Change Control Board: Change Request Review

The following review must be completed by an authorized member of the Change Control Board.

• 1. Review all computer code.
• 2. If any changes occur to the input syntax, there must be an accompanying change to the user manual and xsd schema. If the input syntax change deprecates existing input files, a conversion script needs to be added (see Conversion Scripts).
• 3. Make sure the Python code and commenting standards are respected (camelBack, etc.) - See on the wiki for details.
• 4. Automated Tests should pass.
• 5. If significant functionality is added, there must be tests added to check this. Tests should cover all possible options. Multiple short tests are preferred over one large tes.
• 6. If the change modifies or adds a requirement or a requirement based test case, the Change Control Board's Chair or designee also needs to approve the change. The requirements and the requirements test shall be in sync.
• 7. The merge request must reference an issue. If the issue is closed, the issue close checklist shall be done.
• 8. If an analytic test is changed/added, the the analytic documentation must be updated/added.
• 9. If any test used as a basis for documentation examples have been changed, the associated documentation must be reviewed and assured the text matches the example.

[dylanjm]

Should we remove this commented code from the outer.xml template file now?

[PaulTalbot-INL]

that's probably a good idea.

[joshua-cogliati-inl]

Removed.

[dylanjm]

Changes look good. New feature is documented.

FUTURE WORK IDEA: Add use-case examples walkthroughs to the wiki, one for local, one for HPC. Also a debugging workflow.