refs 2931

- Add parser interface for exploration expression language (visitor). This includes an additional EOperation for IExpressions to accept visitors.
- Implement a base class for expression evaluators.
- Add a Deployment validator that performs an evaluation against a given ExplorationSpecification and which uses expression evaluator base class.
- Add a context menu entry to launch the Deployment validation.
- Add two Utility methods to handle integer and floating point numbers.
refs 2960

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refs 2898

- Enable specialized handling for feedback edges (results into slightly larger, but more meaningful diagrams)
refs 2898

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- Extract IAutoLayouter interface
- Do not use static variables to keep state for static methods!
- KAutoLayout may be re-used for multiple layout jobs, but the code is not reentrant!
refs 2998

- Performance:
  - Do not use Eclipse Job. Action is already in a separate thread, and 'Job' is much slower
  - Disabled annotation view update when applying layout update
refs 2898

TODO: Use progress monitor of Eclipse Job
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refs 2898

- Initial import of KIELER-based auto-layout initially implemented by Philip Offtermatt (offtermatt@)
- TODO
 - Code cleanup
 - UI integration

refs 2898

refs 2898

- Initial Import of KIELER-based auto-layout initially implemented by Philip Offtermatt (offtermatt@)
- TODO
 - Code cleanup
 - UI integration

refs 2953

- See https://github.com/lcaron/opal/
refs 2943

- Ensure that candidate objects to populate annotations of type EReference are sorted before being presented to the user
refs 2943

- In simplified constructor of EcoreSerializerBase, set default values for charset (UTF-8) and XSD schema file (null)
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