[Groff] URL references in .Rs/.Re

[Joerg Sonnenberger]

Hello,
in the current form groff doesn't deal well with URL references for
bibliographic entries. There is no documented markup to specify a URL as
part of .Rs/.Re entries. .Lk doesn't behave properly as can be seen with
the timecounter(9) man page on NetBSD.

I propose to add a new macro .%U to allow such references. Preliminary
patch without integration into the HTML backend is attached. I do not
mind the implementation details, but I would like to see a consensus of
how this should be done.

Joerg

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