Convert remaining uses of svn_io_open_unique_file2 to other function calls, as appropriate.
* subversion/libsvn_subr/subst.c: (svn_subst_copy_and_translate3, svn_subst_create_translated): switch to svn_stream_open_unique
* subversion/libsvn_subr/io.c: (svn_io_copy_file, svn_io_file_move): switch to svn_io_open_unique_file3. (reown_file): switch param from PATH_APR to just PATH. all the calls were to SVN functions, so we should not be using an APR path. switch to svn_io_open_unique_file3. (io_set_file_perms): pass svn-internal path to reown_file.
* subversion/mod_dav_svn/activity.c: (dav_svn__store_activity): lose a bunch of code in favor of svn_io_write_unique().
* subversion/tests/libsvn_repos/repos-test.c: (authz_get_handle): revamp to use svn_io_write_unique and other svn-style IO functions.
* subversion/svn/util.c: (svn_cl__edit_string_externally): change parameter to FILENAME rather than PREFIX. switch to svn_io_open_uniquely_named.
* subversion/libsvn_wc/props.c: (open_reject_tmp_file, svn_wc__merge_props): switch to svn_io_open_uniquely_named.
* subversion/libsvn_client/externals.c: (relegate_dir_external): switch to svn_io_uniquely_named.
* subversion/libsvn_fs_fs/fs_fs.c: (svn_fs_fs__set_revision_proplist): switch to svn_stream_open_unique (svn_fs_fs__set_uuid): revamp to use svn_io_write_unique