bug#27940: Recursively delete dir34? (yes, no, all, quit)

[積丹尼 Dan Jacobson]

dired-do-flagged-delete and me interaction:
Recursively delete dcepc? (yes or no) yes
Recursively delete emmpc? (yes or no) yes
Recursively delete zpspc? (yes or no) yes
Recursively delete dgcpc? (yes or no) yes

Wouldn't it be nice if there was instead:
Recursively delete dgcpc? (yes, no, all, quit)

Yes, if before we started we set the variables we needn't be asked all
those questions.

But now *midway* through the list, we decide we would like no more
question, there should be a way, without needing to quit and start over,
even if doing that isn't so bad.