return true, if the directory is not initialized, or if the directory
does not contain the entry, but the given path is absolute. This change
makes it less compatible with R5, but more consistent with the BEntry*
version and undoubtfully more compatible with common sense.
git-svn-id: file:///srv/svn/repos/haiku/trunk/current@5884 a95241bf-73f2-0310-859d-f6bbb57e9c96