Remove the parent pointers - instead its a flag to indicate that the blob
has a parent. This can then be checked to ensure that we never free such
blobs (they should always be removed from the parent which will free them)

CVS patchset: 5075
CVS date: 2005/02/20 14:34:16

Mercurial revision: 225834d9395eca4178e81cdf6655101c8ef4cd6b