clean up the validators, now only with FARM_SISO and FARM_MIMO

[wanghy-anl]

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Pull Request Description

What issue does this change request address?

No related issues, but to clean up the validators list for FARM 2024 March 31 deliverable

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

1. Removed the prototype validators "FARM_Beta" and "FARM_Gamma_LTI"
2. Renamed the "FARM_Gamma_FMU" as "FARM_SISO"
3. Renamed the "FARM_Delta_FMU" as "FARM_MIMO"

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• 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.
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[wanghy-anl]

@PaulTalbot-INL @dylanjm Gents, I would like to clean up the FARM validator list from HERON/src/validators/Factory.py.
Now there are only two validators left:

• FARM_SISO (which is FARM_Gamma_FMU in the past) and
• FARM_MIMO (which is FARM_Delta_FMU in the past).

After this clean-up, a lot of repetition in the user manual could be cleared. The capabilities of FARM_Beta and FARM_Gamma_LTI has been merged into FARM_SISO.

Could you review and merge this PR?
Thanks,
Haoyu

[dylanjm]

Changes look good and all tests pass. Approved to merge.

[dylanjm]

@wanghy-anl This has been merged, please submit a submodule update to RAVEN if you need these features in the upcoming release of RAVEN.

[wanghy-anl]

@dylanjm Thank you Dylan. Do you have any plan on updating the HERON submodule in the next weeks? I would like to coordinate the development of FARM based on your schedule, so we can have FARM validator working together with HERON at the same time.