#1 improve navigation on detail view

[Peter Grund]

It would be nice to have an improved navigation tree on "detail View" tab.

Navigation via tree, separation by groupId.

currently:
- de.schlund.controlpanel:controlpanel-de
- de.schlund.controlpanel:controlpanel-uk
- de.schlund.controlpanel:controlpanel-fr
- de.schlund.controlpanel:controlpanel-us

desired:
- de
|-.schlund
| -controlpanel
|- controlpanel-de
|- controlpanel-uk
|- controlpanel-fr
|- controlpanel-us