cp, mv: remove 3-year-deprecated+warned-about --reply option

cp, mv: remove 3-year-deprecated+warned-about --reply option

* src/cp.c (reply_args, reply_vals): Remove globals.
[REPLY_OPTION]: Remove enum.
(long_opts) ["reply"]: Remove initializer.
(main): Remove case stmt.
* src/mv.c: Likewise.
Don't include "argmatch.h".  No longer used.
* NEWS (Changes in behavior): Mention this.
* tests/Makefile.am (TESTS): Remove mv/reply-no.
* tests/mv/reply-no: Remove file.
* tests/mv/i-link-no: Update, now that --reply= is gone.