Fix RootSystem
to use the correct field for determining eigenvectors
#4665
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It was assumed that the DefaultField of the minimal polynomial is the field to factor it over. In some cases, i.e. x^2+1 for some Lie Algebra over CC (=Field(E(4))) this differs and thus makes RootSystem fail.
Now, it uses the field of the lie algebra.
Closes #4661
Text for release notes
see title