Installing Weka through weka-virtualenv

So far, installating Weka through weka-virtualenv was only available on the command-line (see my previous post).

Today, I rectified this by adding a more convenient way of installing Weka to the user interface.
Furthermore, I also added support for configuring proxy settings to the command-line and user interface (http, ftp, socks).

The latest version is 0.0.19.