fixed bug in filling in nearest ancestral state. was ignoring input sequence in the backward pass
fixed bug in filling in nearest ancestral state. was ignoring input sequence in the backward pass

blab/stability,doerlbh/Indie-nextflu,blab/nextflu,doerlbh/Indie-nextflu,blab/nextflu,doerlbh/Indie-nextflu,blab/nextflu,doerlbh/Indie-nextflu,fw1121/nextflu,blab/stability,blab/stability,blab/nextflu,fw1121/nextflu,blab/stability,fw1121/nextflu,blab/stability,fw1121/nextflu,blab/nextflu,blab/stability