Make eigensolver use regular diagnostics output

PR #775 adds the ability for the eigensolver to call our regular diagnostics methods to write out various derived quantities to our standard output file. This should also include the eigenmode structures.

As noted in the PR, if we could ensure the calculation of omega in these diagnostics routines reproduced the correct eigenvalue we might be able to drop the special eigenvalue output file as all information would be contained in the regular output file.

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