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