RFC vgrind in base (and buildworld)

Hello,

Currently our buildworld relies on groff(1) and vgrind(1) being present
in the host system. I have a patch ready that at least makes sure these
are built during bootstrap-tools and completes the WITHOUT_GROFF flag.

vgrind(1) is only used for two papers under share/doc and we could
easily expand the results and commit them to svn directly, alleviating
the need to run vgrind(1) during buildworld.

OTOH, there are much more useful tools to vgrind(1) for source code
formatting. So do we still have vgrind(1) users out there?

Regards,
Uli