[libunwind] man page for libunwind API overview

[David Mosberger]

Just added a man-page for libunwind(3) - which is a brief API overview.
Not much, but it's a start. ;-)

It's both in the bk tree and on the web site at:

  http://www.hpl.hp.com/research/linux/libunwind/docs.php4

Actually, it's not there as of right now, but it should show up
in a couple of hours.

Enjoy,

        --david