These functions have been removed to reflect changes in dplyr.
group_by_.treedata: This function is defunct, use group_by instead.
mutate_.treedata, mutate_.grouped_treedata: This function is defunct, use mutate instead.
slice_.treedata: This function is defunct, use slice instead.
select_.treedata: This function is defunct, use select instead.
filter_.treedata,filter_.grouped_treedata: This function is defunct, use filter instead.