Avoid to display the same info / warning / error twice, since several nodes may reference the same model element
Removed useless project (it was a sample project to create an interpreter)
This version is no more up to date, either for the Workshop or for any other work
Bug fix #242 : Add context information in the parse error message
Bug fix #241 : Refactored the way things are searched for in the model / spec / tests to be sure that all strings are taken into account. Before, only the element name and the expressions were taken into account