Corrected bug in SDF3Printer printing timings with wrong format due to changes in the Timing class (parameterized timings with expressions).
To export a corect SDF3 graph, all timings must be evaluated before export.
Added a test to check if a DAGVertex has a kind before switching on it. If no, vertex is exported as kind "vertex" (standard kind of vertices).
Refactored the Sdf3Importer class to extract engine in class SDF3ImporterEngine.
Added a new workflow task to export a set of SDFGraphs in SDF3 format.
Id is: org.ietr.preesm.algorithm.exportSdf3Xml.MultiSDF3Exporter
Takes as inputs: scenario (PreesmScenario), architecture (Design), SDFs (Set<SDFGraph>)
Merge branch 'bugfix-timings_export_to_SDF3' into develop
Merge branch 'tutorials-PiMM-migration' into develop