FCurveDotConformalBlockDivisor -- intersection of an F-curve with a conformal block divisor

This function implements the formulas given in [Fakh] Prop. 2.7 and Cor. 3.5. Note: in contrast with most of the other functions in this package, this function is for UNsymmetrized curves and bundles. The F curve must be entered as a partition of the set {1,...,n} into four nonempty subsets.

The example below shows that the first Chern class of the conformal block bundle $V(sl_2,1,(1,1,1,1,1,1))$ intersects the F curve $F_{123,4,5,6}$ positively, and intersects $F_{12,34,5,6}$ in degree zero.