Remove tree() from libite, moved to troglobit/toolbox.git instead

Signed-off-by: Joachim Nilsson <troglobit@gmail.com>

README.md

@@ -278,12 +278,6 @@ Generic Functions
   **Note:** Requires Linux v3.11, or later, will fall back to the old
     and unsafe `tmpfile()` on older systems.
 
-- `tree(path, show_perms)`
-
-  Very simple `/bin/tree` replacement.  Draw ASCII tree of `path`, with
-  optional listing of file and directory permissions if `show_perms` is
-  set.  The `path` argument should be a directory.
-
 - `which(cmd)`, `whichp(cmd)`
 
   C implementation of UNIX which(1).  Returns a malloc'ed string with the