BenoitMorel

This should not affect the documented features of GeneRax, but we should nonetheless fix it!

In particular, it is very difficult for users to count the number of extinctions per species, because the losses are only detected as SL events at the parent level. See...

See discussion here https://groups.google.com/g/generaxusers/c/p5vph7ytOnU/m/tlnZSPCnCwAJ