Merge pull request #1 from foosel/devel

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Merge pull request #2 from foosel/devel

Devel
Merge pull request #4 from foosel/devel

Devel
Merge remote-tracking branch 'upstream/devel' into devel
Bug fix for Emergency Stop
Merge pull request #473 from Salandora/EmergencyBug

Emergency Stop should not only trigger an event but also at least cancel the print

Closes #448