Prints annotated config

def cmd_annotate(self, argv, help):
        """Prints annotated config"""
        parser = argparse.ArgumentParser(
            prog="%s annotate" % self.progname,
            description=help,
        )
        parser.parse_args(argv)
        list(self.instances.values())  # trigger instance augmentation
        for global_section in sorted(self.config):
            for sectionname in sorted(self.config[global_section]):
                print("[%s:%s]" % (global_section, sectionname))
                section = self.config[global_section][sectionname]
                for option, value in sorted(section._dict.items()):
                    print("%s = %s" % (option, value.value))
                    print("    %s" % value.src)
                print()