datafeed fixes; line drawing fix

src/components/chart/RungBuilder.vue

@@ -148,6 +148,7 @@ const rungsDisabled = computed(()=>endpoints.value[0]===null)
 
 const values = computed(()=>{
   let [a, b] = endpoints.value
+  // console.log('generating values for endpoints', a, b)
   a = vectorize(a)
   b = vectorize(b)
   const r = props.builder.rungs