tor-spec.txt tweaks from arma

   RELAY_TRUNCATED cell.

   [Note: If an OR receives a TRUNCATE cell and it has any RELAY cells

   still queued on the circuit for the next node that it had not yet sent,

   it will drop them without sending them.  This is not considered

   conformant behavior, but it probably won't get fixed till a later

   version of Tor.  Thus, clients SHOULD NOT send a TRUNCATE cell to a

   node running any current version of Tor if they have sent relay cells

   through that node, and they aren't sure whether those cells have been

   sent on.]

   still queued on the circuit for the next node it will drop them

   without sending them.  This is not considered conformant behavior,

   but it probably won't get fixed until a later version of Tor.  Thus,

   clients SHOULD NOT send a TRUNCATE cell to a node running any current

   version of Tor if a) they have sent relay cells through that node,

   and b) they aren't sure whether those cells have been sent on yes.]

   When an unrecoverable error occurs along one connection in a

   circuit, the nodes on either side of the connection should, if they