accesor-tidytree docs

[nick-youngblut]

While https://yulab-smu.top/treedata-book/chapter2.html#accesor-tidytree is very helpful, one is still left wondering after reading this section:

• How does one list all nodes labels/numbers or branch length?
  • Must one just resort to conversion to a tibble just to get values from 1 column in the table?
• How does one list all internal/leaf nodes?
  • This is especially confusing/challenging since conversion of a tbl_tree object to a tibble drops the isTip column
  • This is important for functions such as treeio::drop.tip