Log Message:
Update p5-Data-Hierarchy to 0.34.
Changes since 0.21:

[Changes for 0.32 - Nov 3, 2006]
* Workaround various performance issues.  The real fix will be in 0.40.
[Changes for 0.31 - Sep 7, 2006]
* Fix a test assuming hash key orders.
[Changes for 0.30 - Jul 25, 2006]
* Big rewrite, simplifying the API and documenting everything.
* Added to_relative (to help with SVK floating checkouts).