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more verbose output from MMA; more paranoia required in feasibility check because feasibility constraints may be violated by rounding errors

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added nlopt_minimize_c function for constrained minimization (only via MMA for now); MMA now passes very simple test cases for constrained optimization

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added luksan/ directory, which will eventually contain several routines written by Prof. Luksan and made available under the LGPL.  currently, I've converted the PLIN.FOR subroutine, which is a reimplementation of the LBFGS algorithm (and removed the lbfgs/ directory, since the code turns out to be non-free)

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switch to "standard" DIRECT-L where we only pick one rect for each diameter in the hull, preferring older rects

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support calling both original and new DIRECT code, make direct limits more dynamic, eps != ftol in direct, fixed bugs in convex hull code for identical points

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add options to use either original Fortran-derived DIRECT code or new C version, use 1e-4 magic epsilon parameter of Jones, dynamically set max #func evals in direct code and increase defaults, and add another performance hack to cdirect

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add initial re-implementation of DIRECT (still too slow because convex hull is re-created from scratch each iter)

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