Revision 1869481

Add 'changelist' option to 'svn info --show-item'.

* subversion/svn/info-cmd.c
  (info_item_t,
   info_item_map): Add 'changelist' item.
  (print_info_item): Print it.

* subversion/svn/svn.c
  (svn_cl__options): Document it.