-option "loglevel" l "set loglevel (0-6)" int typestr="level" default="4" no
+option "loglevel" l "set loglevel (0-6)" int typestr="level" default="4" optional
option "list_receivers" L "print list of available receivers" flag off
option "receiver" r "Select receiver.
-r 'http -i www.paraslash.org -p 8009'
"
-string typestr="receiver_spec" default="http" no
+string typestr="receiver_spec" default="http" optional