Fix several bugs in the eigenvector code for 2x2 and 3x3 symmetric matrices.

Oliver Sanderrequested to merge
fix-eigenvectors-some-more into master

This merge request fixes three bugs in the eigenvalue/eigenvector code for 2x2 and 3x3 symmetric matrices. Surprisingly, all three bugs can be triggered by using particular diagonal matrices.

Edited by Oliver Sander

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