Log Message:
Update GNU ed to 1.13.

2016-01-24  Antonio Diaz Diaz  <antonio@gnu.org>

        * Version 1.13 released.
        * buffer.c (put_sbuf_line): Fixed a memory leak.
        * io.c (read_file, write_file): Close file on error.
          (Both issues reported by Cédric Picard).