Simulates from the generalized Dickman distribution by using Algorithm 3.1 in Dassios, Qu, and Lim (2019). This distribution has Laplace transform
L(z) = exp( t int_0^b (e^(-xz)-1) x^(-1) dx), z>0
and Levy measure
M(dx) = t x^(-1) 1(0<x<b) dx.
When b=1 and t=1, this is the Dickman distribution.