[ESS] Path completion

[Ronaldo Reis Junior]

Hi,

In my Emacs+ESS, filename completions work, but it put all path in my code, 
like this:

"/home/ronaldo/R/test.R"

but I working in this directory, also it is more beautiful to put only 
"test.R" without the complete pathname. For classrooms this is essential 
because 
students tend to copy exactly that is show in the screen, including my own 
path.

How to configure this in emacs+ESS

Thanks
Ronaldo
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