Improved printing of stream objects.

* stream.c (null_stream_print): Static function removed.
(stream_print_op): New function. Prints stream's name and address.
(null_get_prop): Pull stream name from strm_ops structure
rather than hard-coding to "null-stream".
(null_ops, stdio_ops, tail_ops, pipe_ops, string_in_ops,
byte_in_ops, string_out_ops, strlist_out_ops, dir_ops,
cat_stream_ops): Use stream_print_op in place of cobj_print_op.
Initialize name.
(stdio_stream_print): Use name from ops structure,
and include object address.
(string_in_get_prop): Likewise.
(cat_stream_print): Likewise.

* stream.h (struct strm_ops): New member, name.
(strm_ops_init): Initialize name.
(stream_print_op): Declared.

* syslog.c (syslog_strm_ops): Use stream_print_op. Initialize name.

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