Added a clustering tab providing functionnalites to cluster Fibers object using QuickBundles algorithme and the MDF distance metric.
Clustering can now be done when fibergroup is selected, it will clustered all Fibers objecs.
Textboxes can now be modified directly.
Made the loading of severals Fibers objects a lot faster by not wasting time selecting each of them.
Added the option to discard bundles having less than a number of streamlines in it.
Added new metric distances
Added more clustering's metrics.
Made 'FindFiberGroupPosition' method public
Replace uint by unsigned int to be cross-platform.