Redesign polynomial-solve, invert matrix
The function #'polynomial-solve is now directly defined with defmfun with a single required argument and two optional arguments: the answer vector-complex-double-float and the workspace, both of which default to the right thing. The returned is now the this marray instead of a list. Simplify the definition of #'invert-matrix and return the matrix-double-float instead of the CL array. All tests pass SBCL and CCL with trace.
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