(options2service): New command.
(make_lsh_userauth): New expression.
(make_lsh_connect): Use options2service.
(main_options): New flags --publickey, --userauth, --no-userauth.
(CASE_FLAG): New macro.
(main_argp_parser): Implemented --userauth and --no-userauth
options, with defaults depending on whether or not SRP is being
used.
Use the CASE_FLAG macro.
(request_userauth_service): New global command object.
(request_connection_service): New global command object.

* src/lsh.c (main_argp_parser): Use new srp-related atoms.

Rev: src/lsh.c:1.110