Allow kmeans to use hyper spectral images

[k034b363]

Is your feature request related to a problem? Please describe.
It's possible that for certain segmentation problems, like separating individual components of fruits or seeds, hyperspectral images might be more consistent across genotypes than RGB. For this reason, it would be useful if kmeans training and classification steps could accept hyperspectral images as input.

Describe the solution you'd like
An additional "mode" parameter for kmeans functions.