renamed onion to messages, created introduction message

pkg/relay/handler-delay.go

@@ -2,15 +2,15 @@ package relay
 
 import (
 	"time"
-
-	"git-indra.lan/indra-labs/indra/pkg/onion/delay"
+	
+	"git-indra.lan/indra-labs/indra/pkg/messages/delay"
 	"git-indra.lan/indra-labs/indra/pkg/types"
 	"git-indra.lan/indra-labs/indra/pkg/util/slice"
 )
 
 func (eng *Engine) delay(on *delay.Layer, b slice.Bytes,
 	c *slice.Cursor, prev types.Onion) {
-
+	
 	// this is a message to hold the message in the buffer until a duration
 	// elapses. The accounting for the remainder of the message adds a
 	// factor to the effective byte consumption in accordance with the time