Add details on region A, B of GPD type

RS parameterisation l3=0 or l4=0 limit results

Check if the sorting in pgl() is worth the computational cost

? support named elements of the vector for parameters ?

Lmoments from parameters
Fitting gpd par with L moments

Should moment fitting return object of class starship?

Estimation of FKML with moments for data as well as given moment values

