[Rd] demo enhancement

[Kjell Konis]

Hello,

I have a package for working with Bayesian networks (RHugin - on R- 
Forge for those interested). It contains a function RHExample that  
does the same thing as the demo function in the utils package except  
that it does not display any output in the R console. I use it to  
build simple networks in the examples section of my .Rd documentation  
files. Anyway, I thought it would be useful if this functionality was  
also part of the demo function. The attached diff adds an echo  
argument to demo which, when set to FALSE, makes demo behave the same  
as my RHExample function. Please feel free to use it if you think it  
would be helpful.

Kjell

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