Outputs of preseqR.rSAC and preseqR.rSAC.bootstrap

Maybe a stupid idea. Since ```preseqR.rSAC.bootstrap``` is bootstrap version of ```preseqR.rSAC```, I expected the returned object to behave similarly. Now estimator returned by ```preseqR.rSAC``` is a function and that returned by ```preseqR.rSAC.bootstrap``` is a list, you need to use ```f``` inside to take the value of ```r```