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These solutions are much more accurate and don't trigger useless clocks in the steps of the solutions

- Allow optimal comparisons between solutions and steps
- /!\ Sets are used so the order of clocks and events are not tested anymore /!\

=> Not supported anymore since it is a private attribute of the C++ class
This feature is only used during tests so, not very important (?)

- Fix temp dirs
- Fix test_frontier for model4
- Use future print_function
- Add doc when possible

Decrease verbosity but this alert was useful...