On the 'move-tracking-2' branch: Sort the output of 'svnmover diff'.

* subversion/include/private/svn_editor3.h,
  subversion/libsvn_delta/compat3.c
  (svn_branch_get_path_by_eid): Make public; renamed from
    'branch_map_get_path_by_eid'. Update all callers.

* subversion/svnmover/svnmover.c
  (diff_item_t, diff_ordering): New.
  (svn_branch_diff): Sort the output before displaying.

git-svn-id: https://svn.apache.org/repos/asf/subversion/branches/move-tracking-2@1638784 13f79535-47bb-0310-9956-ffa450edef68