[Rd] par()$ask in plot.acf

[Paul Gilbert]

There seems to be a problem with acf (in both R-2.0.1 and R-2.1.0beta)
not passing par()$ask to the plot routine. I think the fix is that the
argument to plot.acf should be changed from
    ask = Npgs > 1 && dev.interactive()
to 
    ask = par()$ask | Npgs > 1 && dev.interactive()
 
Paul Gilbert

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