module directory has changed (eg. "darwin-2level" vs.
"darwin-thread-multi-2level").
binary packages of perl modules need to be distinguishable between
being built against threaded perl and unthreaded perl, so bump the
PKGREVISION of all perl module packages and introduce
BUILDLINK_RECOMMENDED for perl as perl>=5.8.5nb5 so the correct
dependencies are registered and the binary packages are distinct.
addresses PR pkg/28619 from H. Todd Fujinaka.
This is a perl module for graph operations as the code was for the 1st edition
of "Mastering Algorithms with Perl", by Jon Orwant, Jarkko Hietaniemi, and John
Macdonald, published in August 1999 by the O'Reilly and Associates.
