Morris optimal

I've created a brute-force implementation of Campolongo et al.'s 2007 paper in which they find optimal trajectories for running elementary effects.

The technique finds the combination of most distant (and different) trajectories from an initial sample pool created using the morris_ee.sample procedure.

It then saves a text file containing a defined number of optimal trajectories.

I have also created a test file using nose tests.

Happy to adjust/amend as you suggest.