rm defunct Nocedal code references (but keep NLOPT_LD_LBFGS_NOCEDAL constant for binary compatibility and as a placeholder if we are able to add in the new BSD-licensed Nocedal code

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cobyla should return ROUNDOFF_LIMITED if it "converges" to zero x tolerance, rather than XTOL_REACHED; thanks to David Liu for the bug report

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handle case of negative rescalings (from negative dx) in COBYLA and BOBYQA; thanks to Alexander Law for the bug report

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just unconditionally disable compilation of matlab & octave plugins unless --enable-shared is turned on, since test was unreliable and the 32-bit systems where static libraries worked are disappearing anyway

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in Matlab/Octave interface, make returning NaN from the objective equivalent to an nlopt_force_stop; thanks to Norman Violet for the suggestion

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lower tolerance for dual optimization in MMA/CCSAQ; thanks to Christophe Leruste for the problem report

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use reciprocal quadratic formula, which is accurate everywhere, rather than switching between quadratic formula and Taylor expansion

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added CCSAQ algorithm; internal support for preconditioners (untested) not yet exported in NLopt API

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--with-cxx should not use -no-undefined, since it deppends on the C++ std libs (which prevents us from building --with-cxx libs for Windows); thanks to Volker Lorrmann for the bug report

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