fixedDifferences(g, count.indels = TRUE, consec.indels.as.one = TRUE,
bases = c("a", "c", "g", "t", "-"))count.indels is TRUE, count
consecutive indels as a a single indel?sites list of sites with fixed differences for each pair of
strata
num.fixed data.frame of number of sites fixed between each
pair of strata
}fixedSites, variableSites