GSL features added in version 1.12; fix spelling
Added faster simplex mininimser using the symbol +simplex-nelder-mead+; the old one is now called +simplex-nelder-mead-on2+. Added new functions #'order, #'size, #'coefficients for Chebyshev; #'order is a generic function. Added methods for vectors with complex elements for elt+, elt-, elt*, elt/. Fix spelling of "paraboloid".
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