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Class "Simplex" supersedes "AbstractSimplex" whose subclasses are replaced by implementations of the "Simplex.TransformFactory" interface. The new classes are immutable. Test suite has been updated. It tries to assess correctness through randomization; however some standard optimization problems entail systematic failures that were previously hidden through using fixed seeds. [The corresponding unit tests are skipped, and further work is needed in order to find out whether those problems are too hard for the algorithm or the issue lies elsewhere.]