Add SchurDecomp() to utility.cc #75
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Adds function SchurDecomp(const MatrixRef& M, Matrix& T, Matrix& Z) which takes the Schur Decomposition of a real matrix M. T is block upper triangular (real Schur form) and Z is orthogonal. If M is anti-symmetric, T is block-diagonal. Includes necessary lapack wrappers dgehrd, dorghr, and dhseqr in lapack_wrap.h and new function SchurDecomp() in matrix.h and utility.cc.