4185 New hash algorithm support

*** 932,942 ****
  
  .sp
  .ne 2
  .na
  \fB\fBchecksum\fR=\fBon\fR | \fBoff\fR | \fBfletcher2\fR | \fBfletcher4\fR |
! \fBsha256\fR | \fBnoparity\fR \fR
  .ad
  .sp .6
  .RS 4n
  Controls the checksum used to verify data integrity. The default value is
  \fBon\fR, which automatically selects an appropriate algorithm (currently,
--- 932,942 ----
  
  .sp
  .ne 2
  .na
  \fB\fBchecksum\fR=\fBon\fR | \fBoff\fR | \fBfletcher2\fR | \fBfletcher4\fR |
! \fBsha256\fR | \fBnoparity\fR | \fBsha512\fR | \fBskein\fR | \fBedonr\fR\fR
  .ad
  .sp .6
  .RS 4n
  Controls the checksum used to verify data integrity. The default value is
  \fBon\fR, which automatically selects an appropriate algorithm (currently,
*** 945,954 ****
--- 945,958 ----
  disables integrity but also disables maintaining parity for user data.  This
  setting is used internally by a dump device residing on a RAID-Z pool and should
  not be used by any other dataset. Disabling checksums is \fBNOT\fR a recommended
  practice.
  .sp
+ The \fBsha512\fR, \fBskein\fR and \fBedonr\fR checksum algorithms require
+ enabling the appropriate features on the pool. Please see
+ \fBzpool-features(5)\fR for more information on these algorithms.
+ .sp
  Changing this property affects only newly-written data.
  .RE
  
  .sp
  .ne 2
*** 2860,2870 ****
  .RS 4n
  Generate a deduplicated stream.  Blocks which would have been sent multiple
  times in the send stream will only be sent once.  The receiving system must
  also support this feature to recieve a deduplicated stream.  This flag can
  be used regardless of the dataset's \fBdedup\fR property, but performance
! will be much better if the filesystem uses a dedup-capable checksum (eg.
  \fBsha256\fR).
  .RE
  
  .sp
  .ne 2
--- 2864,2874 ----
  .RS 4n
  Generate a deduplicated stream.  Blocks which would have been sent multiple
  times in the send stream will only be sent once.  The receiving system must
  also support this feature to recieve a deduplicated stream.  This flag can
  be used regardless of the dataset's \fBdedup\fR property, but performance
! will be much better if the filesystem uses a dedup-capable checksum (e.g.
  \fBsha256\fR).
  .RE
  
  .sp
  .ne 2