Useless variable
Allow to perform a substep (UpdateInternal, Verify, Process, UpdateOut, CleanUp) directly in the test view
Bug fix : Expressions need a root node to be evaluated. Take the first dictionary of the system as root node
Resource of substep
Removed the sub variables tree nodes to speed up interpretation
Precisely determine when a change occured in the time line to update the view accordingly
Allow to perform a textual entry