[Groff-commit] Changes to //var/cvs/groff

[wlemb]

Log from commit: 

Update of /var/cvs/groff/tmac
In directory genba:/vol2/tmp/cvs-serv16023/tmac

Modified Files:
        groff_mdoc.reference.man 
Log Message:
Implemented new read-only number register `.linetabs' which returns
1 if in line-tabs mode, 0 otherwise.

* env.h (environment): Add get_line_tabs() member.
* env.cc (get_line_tabs): New function.
* init_env_requests: Use it.
* NEWS, src/roff/troff/troff.man, man/groff.man: Document it.

* VERSION, REVISION: Changing to 1.17.0.