update to cdpack-1.1.

Changes are:

add a '-X directory' option which allows you to specify a directory whose
contents should be included on the last CD of the set.  This is useful
for including, for example, a pkgsrc.tar.gz tarball which doesn't need
to be duplicated on each CD.

make the usage output be a little better.  in particular, list the options
and mention the existance of a manpage.

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