More on minimum_pension

Remove yearsim and introduce dispositif
Merge with master
Beginig of print_decorator

With an example
add decorator
first example of print_decorator
Work in progress on print_decorator
bad improvments...
much better improvments
cleaning
to_print option in simulate
define a function in evaluate
Merge remote-tracking branch 'origin/add_log'

Conflicts:
	regime_prive.py
	simulation.py