Fill the dictionary with all defaults

def set_defaults(self):
        """
        Fill the dictionary with all defaults
        """
        self['mswitch'] = '***FILES***'
        self['elem'] = '../grid/elem.dat'
        self['elec'] = '../grid/elec.dat'
        self['rho'] = '../rho/rho.dat'
        self['config'] = '../config/config.dat'
        self['write_pots'] = 'F'  # ! potentials ?
        self['pot_file'] = '../mod/pot/pot.dat'
        self['write_volts'] = 'T'  # ! measurements ?
        self['volt_file'] = '../mod/volt.dat'
        self['write_sens'] = 'F'  # ! sensitivities ?
        self['sens_file'] = '../mod/sens/sens.dat'
        self['another_dataset'] = 'F'  # ! another dataset ?
        self['2D'] = '1'  # ! 2D (=0) or 2.5D (=1)
        self['fictitious_sink'] = 'F'  # ! fictitious sink ?
        self['sink_node'] = '1660'  # ! fictitious sink node number
        self['boundary_values'] = 'F'  # ! boundary values ?
        self['boundary_file'] = 'boundary.dat'