Log Message:
Update to 0.06.
Changes since 0.03:
0.06 Fri. Nov. 17, 2006
    - Added tests from konobi
    - Added some other new tests too
    - Fixed infinite loop on recursive heirarchies

0.05 Fri. Aug. 25, 2006
    - Add the ability for the caller to supply a persistent
      merge cache hashref

0.04 Wed. Aug. 09, 2006
    - Remove accidental "use Class::C3" from t/006_complex_merge.t
     (no functional changes from 0.03)