_name : Name of the instance (the name given as parameter if there's one, a name created otherwise)
_model : Name of the model given as argument
_real_model : Name of the model created thanks to _model and all the parameters
_map : Dictionnary map given at the instanciation
_param : Dictionnary param given at the instanciation
_st_cell : The stratus cell which the instance is instanciated in
_st_masterCell : The stratus master cell of the instance
_plac : tells if the instance is placed or not (UNPLACED by default)
_x, _y : the coordinates of the instance (only for placed instances)
_sym : the symetry of the instance (only for placed instances)
_hur_instance : The hurricane instance (None by default)
_hur_masterCell : The Hurricane master cell of the instance (None by default)