s-roff-sync.1

This tag points to the S-roff tree after all the synchronization was
done.  I.e., any non-GPL3 covered changes of the GNU roff [master]
branch until 2015-05-20 have been incorporated, any NetBSD change on
their local GPL2 GNU roff tree from the years 2006 - 2014.
The script ./s-gnu-diff.sh can be used to compare the trees of S-roff
and GNU roff (look in the script head, say "MANUALS=false" to get
a significantly smaller diff).

We don't include some changes consciously, but others will come once
i have implemented the code myself in a building and running S-roff,
in order to avoid copyright violations (GPL3 is free, so i hope
thinking the changes myself is sufficient to avoid violations).

It wasn't planned that way, so unfortunately [s-roff-sync.1] already
includes the [topic/file_case] branch that encapsulates searchpath::
stuff into the new file_case class (allowing `.so' to include
compressed files; in fact allowing *any* ROFF file to be compressed).
And tmac-mdoc.7.in is mdocmx(7)ified already.
And some only-style changes exist, like placing class members in the
implicit private: range before going public: explicitly.
Sorry especially for the latter.  It wasn't planned that way.
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