This is a new, simple non-linear solver that uses a swarm
(population) to do global optimization. It uses two algoritms -
Particle Swarm Optimization (PSO) or Differential Evolution (DE)
to find a (non-optimal) solution.

It is experimental as not all functions are implemented and it
needs a lot more testing so that it performs well.

Change-Id: If55dad7eda17394851a9d178ad892de771eca7c9
Reviewed-on: https://gerrit.libreoffice.org/44382Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Tomaž Vajngerl <quikee@gmail.com>