'Get combined definition option (as string) using pre-set and init
options as preselection (values with higher precedence as specified in section).
Can be used only after calling of getOptions.'

def getCombOption(self, optname):

    try:
        return self._defCache[optname]
    except KeyError:
        try:
            v = self.get('Definition', optname, vars=self._pOpts)
        except (NoSectionError, NoOptionError, ValueError):
            v = None
        self._defCache[optname] = v
        return v
