add --print-uris or --dry-run

[Dan Jacobson]

Wget needs a --print-uris or --dry-run option, to show what it would
get/do without actually doing it!

Not only can one check if e.g., -B will do what they want before
actually doing it, one could also use wget as a general URL extractor,
etc.

--debug is not what I'm talking about. I'm more talking about someting
like apt-get's --print-uris.

--print-uris

[Dan Jacobson]

Wget should have a --print-uris option, to tell us what it is planning
to get, so we can adjust things without making commitment yet.
Perhaps useful with -i or -r...