On the fsfs-format7 branch: Reduce the dependency on TXN_IDs in tree.c.

This is part of the "numerical IDs" patch series.

* subversion/libsvn_fs_fs/tree.c
  (): key-gen #include no longer necessary
  (get_copy_inheritance): drop TXN_ID parameter as it is not used;
   compare copy IDs directly
  (open_path): replace TXN_ID parameter by a boolean
  (get_dag,
   fs_change_node_prop,
   fs_make_dir,
   fs_delete_node,
   copy_helper,
   fs_make_file,
   apply_textdelta,
   apply_text,
   fs_closest_copy,
   history_prev,
   get_mergeinfo_for_path_internal): update callers

git-svn-id: https://svn.apache.org/repos/asf/subversion/branches/fsfs-format7@1453597 13f79535-47bb-0310-9956-ffa450edef68