Merge pull request #3 from mlund/master

merge w. bjorn
Merge pull request #4 from mlund/master

merge w. bjorn
wrl output
Merge pull request #15 from alab0329/master

dipole visualisation
Disabled alexei examples due to missing sources
fixed empty rdf in polymers example
Merge pull request #2 from mlund/master

merge w. mikael