Eigen paralelization

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General Eigen parallelism: https://eigen.tuxfamily.org/dox/TopicMultiThreading.html

Eigen uses number of threads specified my OpenMP, unless Eigen::setNbThreads(n); was called.

Exectuion on PC with 4 cores and 8 hyperthreads:

Speedups Ax.png L2hit.png L3hit.png

Execution on Intel Phi:

Speedups phi.png L2hit phi.png L3hit phi.png

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