bug#10242: dired-do-rename should mention that it did at least copy the file

[jidanni]

The user tries to move one of root's files, using
R runs the command dired-do-rename
and gets
Move `/tmp/075.127.075.210.00080-218.174.214.026.44260' to 
`/cf/075.127.075.210.00080-218.174.214.026.44260' failed:
(file-error Removing old name operation not permitted 
/tmp/075.127.075.210.00080-218.174.214.026.44260)
so then he decides to use
C runs the command dired-do-copy
and gets
Overwrite `/cf/075.127.075.210.00080-218.174.214.026.44260'? [Type yn!q or C-h] 
n
Copy `/tmp/075.127.075.210.00080-218.174.214.026.44260' to 
`/cf/075.127.075.210.00080-218.174.214.026.44260' failed:
(file-already-exists File already exists 
/cf/075.127.075.210.00080-218.174.214.026.44260)

Any why? Because the first message forgot to tell him that indeed the
file was at least, yes, successfully copied.