vle-0.8.2

VLE 0.8.2

* project:
vle: fix cflags include directories in pc files: In the same version of VLE (ie. same major and minor version, only the patch changes), we do not modify the paths of include directories.

* extension:
difference equation: fix bug on dynamic creation and history: When a coupled model is created dynamically and it have several atomic models based on DifferenceEquation extension, if an atomic model have a history, this history goes out the coupled model and it is possible that an atomic model is running and receive this history. This case proceed a bug (an exception).

* manager:
fix the way to stop threads: In multi threading (JustRunThread, ManagerRunThread, SimulatorDistant), when the threads were stopped, delete functions were called on Mutex objects that yielded to segmentation fault.

* gvle:
Modeling plugin:
- FSA: Add fsa modeling plug-in for Statechart, the code, the input/output ports and observables are generated. The conditions are generated because the Statechart extension doesn't need specific conditions.
- Difference Equation: add the generation of observables.