excessive resync errors from 4.2 restore

[RSanders at USGS2-MULTICS.ARPA]

More details on our problem -

re:  Dave Johnson's message -
  We have a 4k/512 user filesystem, and the resynch errors are real
enough to cause restore NOT to restore certain files asked for
individually from our level 0 dumps.  I don't have the capacity to
attempt a complete filesystem restore.

re:  Henry Spencer's message -
  I haven't done any kind of dump in multi-user mode since my PDP 11/34
- V7 days - even our daily incrementals are done single-user.

Other details -
  We haven't seen this problem on our daily/weekly tapes - yet.  We have
a relatively low level of requests for file restores from backup.

  We've had no complaints from tar, dd, or vmstape, from reading/writing
tapes from/to various foreign systems (as well as our own).  Some of
these systems are very foreign - tar tapes to/from Multics, for example.

-- Rex