Format warnings to a list of results.

        @param warnings: a dict of warnings produced by parseWarnings
        @return: a list of warnings in string

def formatWarnings(self, warnings):
        """
        Format warnings to a list of results.

        @param warnings: a dict of warnings produced by parseWarnings
        @return: a list of warnings in string
        """
        lines = []
        for modulename in sorted(warnings):
            lines.append(self.prefixModuleName + modulename)
            lines.extend(sorted(warnings[modulename],
                         key=lambda x: x.split(":")[1]))

        return "\n".join(lines)