[Rd] Removing cran mirrors

[Hadley Wickham]

> Fritz does that from time to time. Note that this is always rather
> cumbersome: trying to contact maintainers whose addresses do not exist any
> more and so on.

I'd be more draconian - if the mirror doesn't update for two weeks,
just cut it off automatically.  If they want to get back on the list,
it's their problem.  It shouldn't be Fritz's problem!

Hadley


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