Integrator loops endlessly for lambert_w(1/x)

> From:  Dieter Kaiser
> 
> Today I have recognized that David Billinghurst has added a 
> test to rtest_lambert_w.mac which fails: 
> 
>   integrate(lambert_w(1/x),x)
> 
> The integrator loops endlessly.
> 
> I had a long search for the problem. The integrator tries to 
> do an integration-by-parts and generates the following integrand:
> 
> %e^(-lambert_w(1/x))/(x*(1+lambert_w(1/x)))

Yes.  I was going to mark it as an expected failure and log a bug
report,
but didn't get the chance yesterday.  Just done so.

	David

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