Patch bugs in the revoking of permissions. We did distinguish between
checking content type perms and item perms when checking if we can
revoke a perm. Moreover, when a permission was revoked it's node
was deleted but the index left in place.
Fix/side-step some ACL bugs. When checking item permissions, always
look for the content type on parent scopes. When linking items, don't
bother looking for annotation perms on the target. Ignore for now what
symettric linking implies (an access point on both items.)