[Rd] barplot documentation bug (PR#919)

[rmh@surfer.sbm.temple.edu]

## documentation error for barplot

p <- c(.5,.3,.15,.05)
par(mfrow=c(4,1))
barplot(p, ylim=c(0,.5), space=0, width=1)
barplot(p, ylim=c(0,.5), space=0, width=.5)
barplot(p, ylim=c(0,.5), space=0, width=.25)
barplot(p, ylim=c(0,.5), space=0, width=.125)


## The widths in the plots are all the same.
## The R documentation for barplot says:
width: optional vector of bar widths.

## The S-Plus 4.5 documentation for barplot is more accurate.  It says:
width	if histo=FALSE, vector of relative bar widths; in this case
	all of the bars are the same width by default. When histo=TRUE, width
	represents where the breaks are for the histogram.
	

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