[config.opts] update
[dune-common] updated to some trunk version
[dune-stuff] set to functions-refactor branch
[pymor] updated
[dune-geometry] added
Revert "[pymor] updated"

This reverts commit 6b2537800b0240e4dbbc0f65ad8b51c1e75cb124.
[submodules] updated
[external-libraries] use eigen 3.2.0
[external-libraries] simple virtualenv for the buildbot
[demos] update