[bug #59482] [ms] implement .EM macro

[G. Branden Robinson]

Update of bug #59482 (project groff):

              Item Group:     Incorrect behaviour => New feature            
                 Summary: groff -ms missing .EM macro => [ms] implement .EM
macro

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Follow-up Comment #1:

.EM is not documented in Lesk 1978-11-13.

It also does not appear in the Berkeley ms manual[1].

It _does_ appear in DWB 3.3 ms[2].

The DWB implementation does the following:

A. Breaks the output line.
B. Checks for and emits a diagnostic for an unclosed abstract (.AB).
C. Checks for and emits a diagnostic for an unclosed footnote (.FS).
D. In troff mode, draws cut marks at (or past?) the page bottom[3].
E. If a keep is pending, starts a new page to flush it (if I follow the logic
of the use of the TB register and KJ diversion correctly).

At first blush, aliasing EM to pg@end-text, documenting EM, and advising the
user to .am (append) to EM if they want to supplement end-of-input behavior,
as UTP and Dorai note, seems like it should resolve the issue.

Comments?

[1] https://www.hactrn.net/ietf/rfcgen/textms.html
[2] https://github.com/n-t-roff/DWB3.3/blob/master/macros/ms/tmac.s.sr
[3] I note this for completeness.  groff_ms(7) already documents that our
implementation does not implement cut marks.

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