error in dweibull (PR#405)

[setzer.woodrow@epa.gov]

Full_Name: R. Woodrow Setzer, Jr.
Version: 0.90.1
OS: linux - Redhat 6.1
Submission from: (NULL) (165.247.155.206)


dweibull(0,1,1) evaluates to 0; it should be 1.  
Note that dweibull(.Machine$double.eps) evaluates to 1.

> dweibull(.01,1,1)
[1] 0.9900498
> dweibull(.00001,1,1)
[1] 0.99999
> dweibull(.Machine$double.eps,1,1)
[1] 1
> dweibull(0,1,1)
[1] 0


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