Defect fix of SimulatedAnnealing with 1 variable optimization

[alfoa]

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Pull Request Description

What issue does this change request address? (Use "#" before the issue to link it, i.e., #42.)

Closes #2295

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

The SimulatedAnnealing could not process 1-variable optimization problem (crash). This PR addresses the problem
maxing sure that ``delta'' variable is always indexable (np array).

A test is added to show that 1 variable optimizations are now possible

In addition, a typo in the Serpent interface is corrected as well (no wrong results to the users but just a crash in case of usage of ``include'' paths sampled by RAVEN.

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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, including run_tests, pylint, manual building and xsd tests. If there are changes to Simulation.py or JobHandler.py the qsub tests must 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 test. If new development on the internal JobHandler parallel system is performed, a cluster test must be added setting, in XML block, the node <internalParallel> to True.
• 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 is the the analytic documentation updated/added?
• 9. If any test used as a basis for documentation examples (currently found in raven/tests/framework/user_guide and raven/docs/workshop) have been changed, the associated documentation must be reviewed and assured the text matches the example.

[moosebuild]

Job Mingw Test on fb16367 : invalidated by @alfoa

fetch failed

[alfoa]

@wangcj05 @mandd ready to review.
Thanks in advance.

[wangcj05]

changes are good.

[wangcj05]

PR checklist is good.