[Groff] Regression tests for tbl

[Eric S. Raymond]

I'm going to take a look at fixing gtbl to handle T{ T} better.

Werner, do you have a gtbl test suite?  If not, would you consider putting
some time into writing test loads and regressions?  

I'd do it, but it's better practice to have the tests written by someone
other than the coder.  Besides, you've already shown that you understand
tbl's edge cases better than I do.
-- 
                <a href="http://www.catb.org/~esr/";>Eric S. Raymond</a>