[SciPy-Dev] Matrix identification methods

[Joseph Gama]

Hi,
Just submitted a PR with these methods:is_matrix_hermitianis_matrix_symmetricis_matrix_skew_symmetric is_matrix_nonsingularis_matrix_singularis_matrix_idempotentis_matrix_positive_definiteis_matrix_positive_semidefiniteis_matrix_negative_definiteis_matrix_negative_semidefiniteis_matrix_indefinite
Feedback is welcome. :)
https://github.com/tuxcell/scipy/tree/helperfuncs
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