use readline in dumb-client

Signed-off-by: Mattias Andrée <maandree@operamail.com>
put process names in quotes and print exit status and termination signal on crashed processes

Signed-off-by: Mattias Andrée <maandree@operamail.com>
m + fix echo server crash

Signed-off-by: Mattias Andrée <maandree@operamail.com>
kernel: put process name in quotes and print exit status and termination signal on crashed processes

Signed-off-by: Mattias Andrée <maandree@operamail.com>