Fixed discontinuities in the Modified Arnoldi driver

Closes #251 (closed)

Proposed solution

Added calls to LocalToGlobal and GlobalToLocal to the generation of the random vector in Modified Arnoldi

Implementation

Issue 251 showed some strange stability results when nvec = 1 and the initial vector was randomly generated in the modified Arnoldi driver due to discontinuities which are smoothed out with the Local to Global to Local calls.

Tests

Suggested reviewers

@ssherw

Notes

Checklist

• Functions and classes, or changes to them, are documented.
• User guide/documentation is updated.
• Changelog is updated.
• Suitable tests added for new functionality.
• Contributed code is correctly formatted. (See the contributing guidelines).
• License added to any new files.
• No extraneous files have been added (e.g. compiler output or test data files).