revise custom status handling

[KerstenBreuer]

Currently, an execution profile can overwrite the automatically set status by a custom status. The custom status is only displayed when the status indicates an unproblematic state. This should be revised.

Problematic is following situation:

• you would like to give a custom status that indicates failure
• then the status has to be "finished", which is contradictory

Moreover, there should be a way to display both in the UI.