improve scalar multiplication for mzed_t

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Issue #9 resolved
Martin Albrecht repo owner created an issue

{{{ #!python sage: MS = MatrixSpace(GF(64,'a'),5000,5000) sage: K = MS.base_ring() sage: c = K.random_element() sage: A = MS.random_element() sage: %time Ac CPU times: user 0.68 s, sys: 0.02 s, total: 0.70 s Wall time: 0.71 s 5000 x 5000 dense matrix over Finite Field in a of size 2^6 sage: MS1 = MatrixSpace(GF(64,'a'),1,5000) sage: B = MS1.random_element() sage: %timeit Bc 625 loops, best of 3: 88.3 µs per loop }}}

This is too slow, cf. http://trac.sagemath.org/sage_trac/ticket/9562

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