Virtual environment manager for Weka now with GUI

Over the Xmas break, I worked a bit on my weka-virtualenv. I reworked things under the hood in order to integrate it nicely into a Swing-based user interface, not only starting applications, but also capturing the output that they generate.

The new release is 0.0.7.

Here is a screenshot of an Experimenter started from the interface and an example experiment finished: