Small modification in the UI of K-means operator.

[fbarth]

The outputs of K-means operator are cluster model (clu) and examples (exa), but in the user interface (UI) of this operator the outputs are named as clu and clu, instead of clu and exa.

[Marius]

Hey, good point, unfortunately renaming the ports would render old processes useless, since in saved processes the connections between operators are stored together with the portnames. So after renaming the ports the old processes could not be loaded anymore.

Best, Marius