Handle node failures like resource failures (observe the ignore|block|fence

option).

Make sure ordering/inputs are set up properly
Add code to actually detect a dirty node
Add a test case for each

CVS patchset: 3817
CVS date: 2004/09/17 15:53:12

Mercurial revision: fe80e59d135214c3e5a3edee3338378f71ca2908