nomcompile3: Build a set of nomenclature files

This constructor establishes the only invariant shared by all subclasses: it stores the abbr argument in the instance attribute of the same name.

# - - -   A b B i n d . _ _ i n i t _ _

    def __init__ ( self, abbr ):
        '''Constructor for AbBind base class.
        '''
        self.abbr = abbr