[#2] Add an option to specify the confirmation prompt text
[#2] Add an option to specify the confirmation prompt text

If present, the first argument is used as the confirmation prompt,
replacing the text "Confirm?" but leaving the following selections
text "[Y/n]" in place.  It can be the empty string, and if so, the
space preceeding "[Y/n]" is omitted.

rriegs/confirm