Experiments panel at user micro-site is incomplete

After the (very useful) mod to all visible objects displayed, there is a small issue concerning the experiment list: we cannot see who's the experiment owner. It would be good to add this field.

As a matter of fact, it would be better to merge "Toolchain" and "Label" into a single heading (called "Label"), for which we print the whole experiment label (i.e. as returned by experiment.fullname()). That would be more consistent with the other panels.