modify multiple line color in scalars (#159)

* modify overlay and offset chart view interplay problem

* resolve frontend fecs problem

* resolve the hover circle problem for histogram

* modify the color of multiple lines in scalar

* adjust the frontend code

* modify san template

* adjust histogramHelper code

* reslove fecs code style problem

* resolve the hover circle problem

* remove debug code

* modify the multiple line color

Author: deqingli

frontend/src/scalars/ui/chart.san

@@ -178,22 +178,16 @@ export default {
         let that = this;
         let option = {
             color: [
-                '#C3D769',
-                '#A2D168',
-                '#F6E753',
-                '#DFDE53',
-                '#89C864',
-                '#6FC16E',
-                '#5FAE7C',
-                '#54957D',
-                '#458C8D',
-                '#4B7C8A',
-                '#3E7586',
-                '#42638E',
-                '#405288',
-                '#464887',
-                '#3D3168',
-                '#391E57'
+                '#c23531',
+                '#61a0a8',
+                '#d48265',
+                '#91c7ae',
+                '#749f83',
+                '#ca8622',
+                '#bda29a',
+                '#6e7074',
+                '#546570',
+                '#c4ccd3'
             ],
             title: {
                 text: tag,