IBP banding data system: Internal maintenance specification

IBP requires that we add the decimal point in the output record, assuming there is a value.

# - - -   M a s s F i e l d . f l a t t e n   - - -

    @staticmethod
    def flatten(massField):
        '''Flatten a mass field.
        '''
        if  massField is None:
            return  BLANK_MASS_OUT
        else:
            return("%*d.%d" %
                   (MASS_OUT_L - 2, massField.value / 10,
                    massField.value % 10))