Simplification of SimulationPredicate elements.
Use of SimulationPredicate in simulation.
+ Correction in SimulationPredicate.
Change structure of Simulation class to have only one function having a loop
and useing SimulationPredicate.
The others "run" function call the generical loop function.
+ Corrections in SimulationPredicate.
Adds a run possibility in Rossler.cpp example file.
Delete PrePostOp objects from Simulation class declaration (there are only
used in parameter of functions).
+ Adds time get/set function.