If Icinga is not running, the view Monitoring Health simply shows a message about the backend not being up and running.
This is of course not so useful as it lacks performance and last runtime information but is does not error.
The process info and the performance info overviews are now moved to
monitoring health and are available both under the 'Monitoring Health'
section. But this is not the final look, we should redesign it and add
more relative information data and drop unused
Stumbled across two issues here:
* It's currently not possible to fetch all (*) columns from a DataView
* Backends are not able to tell their names
Worked around the first issue by naming all columns and implemented a
quick & dirty solution for the second one.
