[ESS] Path completion

[Ronaldo Reis Junior]

Catching a ride in this thread, in my Emacs completions work, but it put all 
path in my code, like this:

/home/ronaldo/R/test.R

but I working in this same directory, also it is more beautiful to put only 
test.R without the complete path. 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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