Documented matrix ops 6 eigenvalue BLAS function dggev
Documented matrix ops 6 eigenvalue BLAS function dggev

finished adding all the comments to explain what each parameter
does and what data type it is. Going to attempt to implement the
function with our given paramters next.


Former-commit-id: d040c9348ff9b7d511ebfe7f8d1e8f91891dada5
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