TODO :
    - see if we can add a person in a Mooring (problem if the boat fleets
      changes between two moorings)
        bool flag "present" relative to "sailson"
    - how to determine which is the right person if choosing from a list and two
      have the same names (rare) :
        name surname - city (country)

Pour la partie NEW ARRIVAL:

	- séparer chaque form:
		séparer company_form, insurance_form, person_form, address_form, stay_form, mooring_form de boat_form
	
	- une url pour:
		-boat_form
		-company_form, insurance_form, (address_form)
		-person_form, (address_form)
		-stay_form, mooring_form