Method get_lines

src/utils/backward.hpp:1668–1671

	}

	lines_t get_lines(size_t line_start, size_t line_count) {
		lines_t lines;
		return get_lines(line_start, line_count, lines);
	}

	// there is no find_if_not in C++98, lets do something crappy to
	// workaround.