Add axes to simulations.
Remove X_AXES and remove obsolete and commented code.
Add options to new_single_entity_simulation.
Move tests in Travis configuration.
Correct test name.
Remove obsolete dependency.
Adding some cotisations patronales parameters
reworking test_brut_to_imposable
transition to new core methods
Still in transition
Transition finished for brut_to_imposable
Cleaning
Typo.
Rework scenarios API.
Improve scenarios API.
Transition for test_irpp

@eraviart: bug involving casting a float64 into a float32 array
Cleaning

but bug remains dear @eraviart
Transition for more tests

But float64/float32 bug still pending
Fix conflict