[R] fun.aggregate=mean in reshape

[hadley wickham]

>  Of course your reasoning is clear and an in better knowledge about R
>  will help me to better interpret its error messages in the future. But
>  for an entry-level R user like me a conflict warning will be quite helpful.

The next version of reshape should do better - I check whether
fun.aggregate is much a function much earlier on, so the error message
should be more informative.

Hadley

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