On the 'move-tracking-2' branch: Add an 'svnmover ls' command to list the elements in a branch.
On the 'move-tracking-2' branch: Add an 'svnmover ls' command to list the
elements in a branch.

* subversion/svnmove/svnmover.c
  (action_code_t,
   action_defn): Add a 'ls' entry.
  (action_t): Remove out-of-date duplicate documentation.
  (list_branch_elements): New, extracted...
  (family_list_branch_instances): ... from here.
  (execute): Implement the 'ls' command by calling list_branch_elements().

git-svn-id: 486ec3464084f62cfe8608152673c827b947faa2@1664403 13f79535-47bb-0310-9956-ffa450edef68

YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion