Clear up confision as to who the original historical authors of code

Clear up confision as to who the original historical authors of code
and manual page were.

For whatever reason it listed myself as a primary author, which is
just not true.

Also, majority of the manpage is copied verbatim from the geom_uzip(4),
contributed by ceri, with only minor adjustments from loos, so put ceri
back into the copyright secrion where he belongs and reflect that in the
AUTHORS section.

For what it's worth, I think this one should be deleted and LZMA
support just folded back into geom_uzip(4) / mkuzip(4) whete it really
belongs.

MFC after:	1 month