delete immutable shares. If corruption is detected, the repairer will
upload replacement shares to other servers, but the corrupted shares will
be left in place.
+ * read-only directories and read-only mutable files must be repaired by
+ someone who holds the write-cap: the read-cap is insufficient. Moreover,
+ the deep-check-and-repair operation will halt with an error if it attempts
+ to repair one of these read-only objects.
* Some forms of corruption can cause both download and repair operations to
fail. A future release will fix this, since download should be tolerant of
any corruption as long as there are at least 'k' valid shares, and repair