[turba] Patch : making sure user can write current source to display the "Add to" widget

[Etienne Goyer]

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Hi,

I see that the "Add to [lists...]" widget is displayed even when a user 
do not have the permission to write to the current source.  I do not 
know if this is an intentionnal behavior.  But, in my installation, 
adding to a list in a source you do not have write access to ('public' 
=> false, not in admin()) do not work, so I believe we might as well not 
display the widget.

I may have gone a little overboard on parenthesis.  Sorry, I am not too 
comfortable with operators precedence.

Thanks !

Etienne

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