Major mode for Ebrowse class tree buffers.
Each line corresponds to a class in a class tree.
Letters do not insert themselves, they are commands.
File operations in the tree buffer work on class tree data structures.
E.g.C-x C-s writes the tree to the file it was loaded from.
Tree mode key bindings:
Uses keymap `ebrowse-tree-mode-map', which is not currently defined. (fn)