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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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darcs-hash:20070901205135-c8de0-23fc5194f42a4bb5c52b8ecb88ab2f404af2907f.gz

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

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darcs-hash:20070830000041-c8de0-33d70f5acd6d321365e0682e49a143b936528f48.gz

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

darcs-hash:20070829234111-c8de0-2ce2867d6444a75b3434ec6b971c0aafefd3d6b2.gz

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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darcs-hash:20070829054323-c8de0-df6dfb55434e77aa9fb87aa0cdb7f14a516379e5.gz

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

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