direct child parser, it's a grand child via client_argp.
(main_argp_parser): At ARGP_KEY_INIT, no longer set
child_inputs[1]. At ARGP_KEY_END, deleted old transport-level
setup which has been  moved to lsh-transport.c.
(fork_lsh_transport): Examing the werror_config object to figure
out which flags to pass on, instead of using the global variables
quiet_flag and friends.

Rev: src/lsh.c:1.200.2.19