[bug #58450] additional inter-sentence spaces should be stretched in fully justified text

[Dave]

Follow-up Comment #1, bug #58450 (project groff):

[comment #0 original submission:]
> This is a groff extension; classical troff's .ss request (as documented in
CSTR #54) took only one parameter.

As a further historical note, while classical troff lacked a mechanism for
specifying the amount of additional inter-sentence space, it _did_ add such
space, and seemingly with the same (subpar) algorithm that this bug report
bemoans: stretching inter-word spaces without restriction but keeping the size
of additional inter-sentence spaces fixed.

That is, running classical troff on the input file attached to _comment #4 of
bug #54101 <http://savannah.gnu.org/bugs/?54101#comment4>_ produces four lines
of output identical to one another -- because the second parameter to .ss is
ignored -- but the same problematic spacing as in groff's output, where spaces
between sentences are only infinitesimally wider than those between words. 
(The difference is really not even detectable to the naked eye; you have to
measure it.)

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