Following up on the deprecation of svn_wc_move(), make the metadata_only
feature available via the new in 1.8 svn_client_move7().

* subversion/include/svn_client.h
  (svn_client_move7): Add argument.
  (svn_client_move6): Update documentation.

* subversion/libsvn_client/copy.c
  (do_wc_to_wc_moves_with_locks2,
   do_wc_to_wc_moves_with_locks1,
   do_wc_to_wc_moves): Forward metadata_only by adding arguments.

  (try_copy): Add metadata_only support.
  (svn_client_copy6): Update caller.
  (svn_client_move7): Add argument.

* subversion/libsvn_client/deprecated.c
  (svn_client_move6): Update caller.

* subversion/svn/move-cmd.c
  (svn_cl__move): Update caller.


git-svn-id: https://svn.apache.org/repos/asf/subversion/trunk@1430273 13f79535-47bb-0310-9956-ffa450edef68
* subversion/libsvn_client/merge.c
  (filter_self_referential_mergeinfo): Restore a comment to here ...
  (prepare_merge_props_changed): ... that had accidentally migrated to here
    during r935685 and r1341101.

git-svn-id: https://svn.apache.org/repos/asf/subversion/trunk@1430277 13f79535-47bb-0310-9956-ffa450edef68