R-beta: deriv()

[Ross Ihaka]

> The deriv() function does not set the class of the result to "expression".
> This means that eval() must be used twice to evaluate the function.

This is very timely.  I have just added a new expression "type" as
opposed to "object" to support mathematical annotation in graphs.
deriv() needs to be converted to the new scheme.  I had forgotten
about it.  The new version is nearly ready.
	Ross
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