bug#21325: ls : feature request --width=zero

[Paul Eggert]

Erik Auerswald wrote:
> an explicit "Inf" keyword is still better than some number that
> relies on system limits

With the latest patch, there are no system limits; you can use as big a number 
as you like.  I'm aware of the "use 0 to denote infinity" tradition, but I'm 
still leery of using a valid width value to denote infinity; I'd rather use some 
other string.