Latin-1 files in groff

There are a number of Latin-1 (ISO 8859-1) files in the groff source
distribution.

I suggest that it would be better for most or all of these to be converted
to UTF-8. On my system, these files do not display correctly, since I have
my system configured to use UTF-8 by default. I think most people are
likely to be in a similar situation.

For example, line 56 of the NEWS file appears on my system as:

   `WE` no longer re�nable it.  This change makes groff mm consistent

Converting to UTF-8, it appears as:

   `WE` no longer reënable it.  This change makes groff mm consistent

If there's a consensus that these files should be converted to UTF-8, I
volunteer to submit a patch.

I haven't closely examined all the relevant files, but for example I'm not
sure what to do about tmac/fr.tmac lines 160-174. (The same file also has a
Latin-1 accented letter in a comment on line 5.)

-- Keith Thompson