Use virtualenv to automatically install python package at configure time
One problem with the general setup of our project is that we are providing both a dune module and a python package. It does not make sense to separate these from each other IMO. Unfortunately, there are some inconveniences with that. One such problem is, that I would expect a dune module to fully setup itself, if configured and build through dunecontrol. As is, we would require installation of the python package though. Installing the python package at configure time does not work for rights issues. One solution to this would be to set up a virtualenv at configure time and install the package into that.
I will investigate this issue and put my results into a branch.