ACO-R implementation working in epic2d n gaussian

Finished an implementation of the Ant Colony Optimization for Continuous
Domains (ACO-R). It is not very optimized but works for problems where
the correlation between parameters doesn't vary too much (ie, dimension
of the parameters is similar). Would need some form of PCA for other
things to work but not a priority.

Needs ability to resume from previous run (cache the solution archive)