OpenOpt 0.28, FuncDesigner 0.18, DerApproximator 0.18

Hi all,
I'm glad to inform you about release of OpenOpt 0.28, FuncDesigner 0.18, DerApproximator 0.18

Main changes:

    * Some bugfixes, mostly related to scipy.sparse matrices used since previous release
    * Export FuncDesigner and OpenOpt LP / MILP to MPS format files

OpenOpt 0.28:

    * New solvers scipy.optimize fmin as scipy_fmin (NLP/NSP), lsqr (LLSP)
    * Major changes for ralg (one of changes - now all active constraints are taken together)

FuncDesigner 0.18:

    * Add FuncDesigner operator ifThenElse
    * Personal tolerances for FuncDesigner constraints
    * now to define equality constraint you can use expression_1 == expression_2, possibly with tolerance as well: (xpression_1 == expression_2)(tol=0.0001)
    * some improvements in automatic differentiation (yet some more remain to be done)
    * "negative tolerances" for constraints (to be strict with appropriate scaling). However, maybe in future it will be replaced by something like myConstr(strict=True) for better understanding.
    * named() marked as deprecated

DerApproximator 0.18:

    * minor code clean up

See also full changelog and future plans

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