e3ddf912841298d6317a682a29cbaf628e86f156
   1tree walking API
   2================
   3
   4Talk about <tree-walk.h>, things like
   5
   6* struct tree_desc
   7* init_tree_desc
   8* tree_entry_extract
   9* update_tree_entry
  10* get_tree_entry
  11
  12(JC, Linus)