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### Description
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Fix MKL enum conversion warning.
### Reference issue
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Fixes#2999.
Closes#2999
See merge request libeigen/eigen!2061
* * *
License disclaimer changed to BSD license for MKL_support.h
* * *
Pardiso support fixed, test added.
blas/lapack tests fixed: Scalar parameter was added in Cholesky, product_matrix_vector_triangular remaned to triangular_matrix_vector_product.
* * *
PARDISO test was added physically.
