added predict.fert.approx(), so fitted fertility schedules can be predicted on new ages with predict(fit, age = 15:49)
Added asymptotic uncertainty estimates for fert.approx() via se.method = "asymptotic", which is now the default when se = TRUE. Bootstrap uncertainty estimates remain available with se.method = "bootstrap".
yll() and mort.approx() now use match.arg() for the type and model arguments, so defaults work when the argument is omitted.
edagger(): corrected the contribution of the open (last) age interval, which previously made e-dagger scale with the life-table radix l0 (it biased overall estimate unfortunately). Results are now radix-invariant.
leslie(): correction to the documentation: before defaults were stated incorrectly.
