Please fix your SVN configurations!

See https://af3-developer.fortiss.org/projects/autofocus3/wiki/Developer_Installation, Section "Initial Workspace Content Check-out", §6.

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Minor cleanup

Dilemma:
 - IPageLayout.ID_RES_NAV is deprecated, but we do not want to migrate to Common Navigator Framework
 - @SuppressWarnings("deprecation") not allowed by coding guidelines
 

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  - It can be used to specify that for a particular model element no editor is available.
  - This avoids that ModelEditorBindingService further walks up the model hierarchy to look for an editor that is registered for one of the ancestors. Currently, this had the the effect that for a model element without explicit editor, the project configuration editor (that is registered for the root element "FileProject") has been opened

Use the the new ModelEditorNotAvailableBinding mechanism for the following model elements
  - SystemSchedule
  - AllocationTableCollection
  - SafetyArgumentationPackage
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 - Triggers
   - F2 hotkey
   - context menu
 - Effects:
   - Raise properties view,
   - Puts focus on "name" field
   - Select all previous contents of "name" field
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- Performed some refactoring (no functional change) and added documentation
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- This prevents a race the 2nd delete operation trying to parse files in the workspace that might have been deleted by the first one in the meantime
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