1 Add nonlinearly constrained multistart algorithm.
3 Add option to control subspace size (mf) in LBFGS etcetera.
5 STOGO has bitrotted - doesn't return proper NLopt codes, doesn't
6 support forced stop, etcetera. Needs to be fixed.
8 If local_optimizer is set, STOGO should use it instead of its
11 Wrappers for GNU R, Java, Perl, Ocaml, C#, ...