Checking in changes prior to tagging of version 2.26.

Changelog diff is:

diff --git a/Changes b/Changes
index 2efca1f..d6817c4 100644
--- a/Changes
+++ b/Changes
@@ -1,3 +1,8 @@
+2.26 -- 2012-08-13
+
+   * Fix from Eric Wong to make IO column display N/A if iostat is broken,
+     rather than 0%
+
 2.25 -- 2012-06-26

    * Simple fix fixing the previous fix to work again for all non-Postgres DBs
mogupload: avoid slurping regular files into memory

This allows uploading of large files that do not fit into memory
again.  Data piped via stdin still uses a huge in-memory buffer
since server support for Content-Range/Transfer-Encoding:chunked
is inconsistent.
support "mogadm device (list|summary) --hostname=..."

For large clusters with many hosts/devices, it is often helpful
to only show the devices for a given host.

This functionality is useful for me since "mogadm device list"
output is not grep-friendly.
mogadm: show weight in "mogadm device list"

mogadm provides a way to set the device weight, so there should
be a way to view it from the same tool.

Conflicts:
	mogadm
mogfiledebug: do not require --domain for --fid

Specifying a domain (even a valid, non-existent one) when one is
not needed hurts usability and confuses users.  Set a dummy
domain for MogileFS::Client if a domain is unspecified and --fid
is used.