Pass complex scalars to GSL functions
By sending the two parts of a complex as separate doubles (complex double-float), or packing the two parts into a one double-float argument (complex single-float), it is possible to pass complex numbers in GSL function calls. This is very likely to be non-portable, so a test is conducted and the results in *pass-complex-scalar-as-two-reals* determine whether defmfun does this translation or just creates a function that signals an error. The complex tests have been modified so that no longer expect an error: SBCL 64: TOTAL: 1223 assertions passed, 5 failed, 0 execution errors. CCL 64: TOTAL: 1228 assertions passed, 0 failed, 0 execution errors. This also works in 32 bit SBCL.
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