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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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performance hack: exploit the fact that the x coordinates (diameters) of the hull in DIRECT fall into only a few different values (although this may change in future modifications); also, we weren't handling the case of equal (x,y) points correctly in the hull code

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only check ftol on iterations where fmin decreased; seems to make this stopping condition much more useful

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saner memory management (and better performance), improved handling of case when no potentially optimal rects are found (choose largest rect with smallest function val, greatly improving many test cases!)

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use red-black tree in cdirect instead of repeatedly resorting ... convex_hull is still O(N), though, and needs to be changed to a dynamic-hull algorithm to reduce the overall complexity below O(N^2), ugh

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added option to StoGO (currently disabled) to use NLopt LBFGS for local minimization instead of StoGO's version

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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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