acb_hypgeom_dilog_transform

Sets res to $\operatorname{Li}_2(z)$ computed by one of the transformations $1/z$, $1-z$, $z/(z-1)$, $1/(1-z)$, selected by algorithm from 1 to 4, followed by acb_hypgeom_dilog_zero at the transformed argument. For algorithm between 5 and 7, it instead starts from the respective point $\pm i$, $(1\pm i)/2$ or $1 \pm i$ (with the sign of the imaginary part of $z$), where $\operatorname{Li}_2$ has a closed form in terms of $\pi$, $\log 2$ and Catalan's constant, and continues to $z$ with the bit-burst method; these require that the imaginary part of $z$ does not contain 0. The result is indeterminate if the transformation is not valid on the whole input ball.