Import of RSAVAGE/Tree-DAG_Node-1.23 from CPAN.

gitpan-cpan-distribution: Tree-DAG_Node
gitpan-cpan-version:      1.23
gitpan-cpan-path:         RSAVAGE/Tree-DAG_Node-1.23.tgz
gitpan-cpan-author:       RSAVAGE
gitpan-cpan-maturity:     released