On the fsx-id branch:

* subversion/libsvn_fs_x/transaction.h
  (svn_fs_x__set_contents): Require a previously optional COPY_ID parameter.

* subversion/libsvn_fs_x/transaction.c
  (svn_fs_x__create_successor): Simplify as COPY_ID is now always given,
                                NODE_ID does never change and the NODEREV_ID
                                can be constructed directly.

* subversion/libsvn_fs_x/dag.c
  (svn_fs_x__dag_clone_child): Always provide the COPY_ID.

git-svn-id: https://svn.apache.org/repos/asf/subversion/branches/fsx-id@1646183 13f79535-47bb-0310-9956-ffa450edef68