This function was deprecated because (1) few people use it, (2) hard to maintain and (3) not
so slow to use the alternative of creating of new pressurepath altogether.
When updating the labelling file of a tag, often, only a few stationary periods are changing. To
avoid recomputing the entire workflow, this function figure out which stationary period have
been changing on only update those in tag$map_pressure and pressurepath.
Usage
pressurepath_update(pressurepath, tag, path = tag2path(tag), quiet = FALSE)