Corrected SubgraphConnector to handle subgraphs without supergraphs:
-if there is no current supergraph, we do not try to connect, preventing NullPointerException
Format.
[Bugfix] Fixed the NullPointerException bug while evaluating expressions in hierarchical graphs.
Exception was due to move of the outer parameters contained expression to configuration input interface. The expression is now copied rather than moved.
[Bugfix] Fixed the NullPointerException bug while visiting a Fifo leaving or entering a hierarchical vertex.
Exception was due to created PiGraphs for subgraphs not added to the piVx2SDFVx map.
Merge branch 'StaticPiMM2SDF' into develop
Cleaned dependencies by removing imported packages and replaced them by required plug-ins when necessary.
Merge branch 'develop' into PiMM-algorithm_checker
Created a PiGraph checker, which checks Refinements and Fifos of a given PiGraph.
It can be launched by a pop-up menu: right-click on a .pi file > PREESM > Check algorithm
or by a workflow task which id is org.ietr.preesm.pimm.checker.task.PiMMAlgorithmCheckerTask and inputs and outputs are a PiGraph
[Bugfix] Corrected the bug preventing new refinements to be set.
SetActorRefinement feature was waiting for an init function to set the refinement.
Release 2.1.0 of PREESM
(Mapper) Bug Fix for win32 (and hopefully Mac OS X): ConcurrentSkipListSet was not working.
Release 2.1.1 of PREESM
Protecting the architecture "contains" test against null pointer exceptions
Started a new workflow element to iterate a single rate IBSDF graph (duplicate the graph).

Signed-off-by: mpelcat <mpelcat@insa-rennes.fr>
Duplicating IBSDF in IterateAlgorithm workflow element
Created a org.ietr.preesm.utils plug-in.
org.ietr.preesm.utils.files contains FilesManager.xtend and Result.java, utils to:
-compare contents of files
-read and write files
-extract files from JARs
Added a ContainersManager.java class to org.ietr.preesm.utils.files
This class is a util to create and delete IProject and IFolder inside a workspace
Added a bundleFilter parameter to the getUrl method, to be able to filter bundles in which to look for a File
Format
Added a getFile method to FilesManager.xtend to return a file using its path and a bundle filter