[Rd] attach behavior

[Erich Neuwirth]

In R 1.9.1, attaching an object more than once puts the object's name on 
the search path more than once also. Therefore, to remove it, one has to 
detach it multiply.
Wouldn'tn it make sense to change the behavior of attach in a way
that object names are not added to the search path more than once?

-- 
Erich Neuwirth, Computer Supported Didactics Working Group
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