(kill_connection): Check the alive flag, and don't call exit here.
(write_packet): Adapted to changes to ssh_write.c. Make sure the
packet is deallocated.
(do_write_packet): This is now a method of the channel_table class.
(make_connection): Deleted exception handler argument.
(fork_lsh_transport): Deleted exception handler argument. Don't
call io_set_nonblocking here.

Rev: src/lsh.c:1.200.2.11