[Rd] getOption("repositories")

[Jeff Gentry]

Out of curiosity, what happened to this?

With 1.8.1 it returns:
> getOption("repositories")
                                     CRAN 
  "http://cran.r-project.org/src/contrib" 
                                     BIOC 
"http://www.bioconductor.org/src/contrib" 

With R-devel it returns:
> getOption("repositories")
NULL

It appears to have been taken out when the changes were committed for the
base package split, from /src/library/profile/Rprofile.unix and
Rprofile.windows but I didn't see any mention of this in NEWS. 

Thanks
-J