hello 2.1.91 pretest

[Karl Berry]

I've (finally) put together a pretest for GNU Hello --
ftp://alpha.gnu.org/gnu/hello/hello-2.1.91.tar.gz

Since more or less the whole purpose is to exhibit best practices for
GNU, I'd appreciate any comments on where things can be improved.  In
particular, I have not followed recent Automake/Autoconf developments in
detail, so the configure.ac and Makefile.am's would be especially good for
others to take a look at.

Thanks,
karl