some dired hints should be background jobs

[Dan Jacobson]

idea, in dired with the cursor on a .pdf file, when we hit ! we get
! on man.pdf: [xpdf] 
[by the way, I just copy-and-pasted that line from the minibuffer
prompt into this message and can't edit it one bit!]
OK, but better a better default would be running xpdf in the
background, for which the user has to type "xpdf * &" which BTW
creates an distracting Async window. Yes, all that can be customized
on one's own.
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