Make markers settings individual per line

src/config.js

@@ -143,7 +143,7 @@ c3_chart_internal_fn.getDefaultConfig = function () {
         grid_focus_show: true,
         grid_lines_front: true,
         // point - point of each data
-        point_show: true,
+        point_show: {},
         point_r: 2.5,
         point_focus_expand_enabled: true,
         point_focus_expand_r: undefined,

src/core.js

@@ -831,7 +831,7 @@ c3_chart_internal_fn.initialOpacityForCircle = function (d) {
     return d.value !== null && this.withoutFadeIn[d.id] ? this.opacityForCircle(d) : 0;
 };
 c3_chart_internal_fn.opacityForCircle = function (d) {
-    var opacity = this.config.point_show ? 1 : 0;
+    var opacity = this.config.point_show[d.id] ? 1 : 0;
     return isValue(d.value) ? (this.isScatterType(d) ? 0.5 : opacity) : 0;
 };
 c3_chart_internal_fn.opacityForText = function () {