I'm sorry that I tried to insert a DOS file

[Dan Jacobson]

I edit a buffer, I insert a file [C-x i] that is a CR-LF file.  The
words "(DOS)" appear in the modeline.  I undo the insert-file step.
The (DOS) remains in the modeline, and indeed, when saving, CR-LF's
are added in the file.

A more pleasant situation would be: I insert the file and I get asked
if I want s) strip the DOS jazz; p) poison the whole original buffer
with DOS jazz; r) treat me rawly, with ^M before my eyes; etc.
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