Brief investigation into test/jacobi/waynew/example2 non-deterministic errors.

Adding the notes (though I intend to get to it for regressions week).
Merge pull request #635 from lydia-duncan/mysteriousJacobiInvestigation

Brief investigation into test/jacobi/waynew/example2 non-det errors.

Adding the notes (though I intend to get to it for regressions week).