Log Message:
Update to 1.17

Upstream changes:
2021-01-06  Antonio Diaz Diaz  <antonio@gnu.org>

        * Version 1.17 released.
        * main_loop.c (exec_global): Make commands 'q' and 'Q' work in a
          global command. (Reported by J. A. Harris).
        * main.c: New option '-E, --extended-regexp'.
          (Suggested by Shawn Wagner).
        * io.c (read_stream_line, write_stream): Add filename parameter.
          Print the file name in case of error. (Reported by Dan Jacobson).
        * global.c: Integrate 'resize_line_buffer' into 'set_active_node'.
        * buffer.c: Integrate 'resize_undo_buffer' into 'push_undo_atom'.

2020-02-20  Antonio Diaz Diaz  <antonio@gnu.org>

        * Version 1.16 released.
        * regex.c (line_replace): Accept 's/^/#/g' as valid.
          (Reported by Bjoern Wibben).
        * main_loop.c: Remove length limit of prompt string.
          (Reported by Tim Chase).
        * main.c: Set a valid invocation_name even if argc == 0.
        * ed.texi: Extended operators depend on regex implementation.
          (Reported by Brian Zwahr).
        * ed.texi: Several fixes and improvements.

2019-01-01  Antonio Diaz Diaz  <antonio@gnu.org>

        * Version 1.15 released.
        * io.c (print_line): Make command 'l' print '\\' before every
          '$' within the text. (Reported by Ori Avtalion).
        * main_loop.c (extract_addresses): Fix address ',,' to mean '$,$'
          instead of '1,$'. (Reported by Matthieu Felix).
        * regex.c (extract_replacement): Allow newlines even if global.
        * main_loop.c (exec_command): Make command 'c' reject address 0.
        * ed.texi: Minor fixes.
        * configure: Accept appending to CFLAGS, 'CFLAGS+=OPTIONS'.

2017-02-22  Antonio Diaz Diaz  <antonio@gnu.org>

        * Version 1.14.2 released.
        * main.c (show_strerror) Revert to using '!scripted' instead of
          'verbose' to enable diagnostics.