OpenOpt release 0.24

Hi OpenOpt users,
I'm glad to inform you about new release 0.24.
Changelog (full version is here):

* New class: MINLP - mixed-integer nonlinear problems
* New class: LUNP - Linear Uniform Norm Problems
* Now DFP can handle user-supplied derivatives
* Some changes for finite-difference derivatives approximation
* New handling of linear equality constraints by ralg and some other changes for the solver
* Some important bugfixes, code cleanup, doc improvements

Backward incompatibilities:
* Connection to PSwarm 1.4 instead of 1.3 (Python API is backward-incompatible for 1.4)
* Default p.storeIterPoints set to False (it affects r.iterValues.x - for large scale problems it eats quite lot of memory)