use deterministic RNG initial state #304
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Closes #303.
Uses a deterministic RNG of
MersenneTwister(seed)
for generating initial vectors in iterative algorithms that use random initial vectors, controllable via anrng
keyword.(In some cases, the
rng
keyword is redundant, because the algorithm alternatively allows you to pass the initial vector directly, but it seemed better to me to have a consistent API that can be used with any of the iterative solvers doing pseudorandom initialization.)(Bumped Julia requirement to 1.4 to support broadcasting RNG objects.)