drop deprecated error bar 'opacity' attribute (use alpha channel of error bar 'color' attribute instead)

Author: emilykl

src/components/errorbars/attributes.js

@@ -121,15 +121,4 @@ module.exports = {
         ].join(' ')
     },
     editType: 'calc',
-
-    _deprecated: {
-        opacity: {
-            valType: 'number',
-            editType: 'style',
-            description: [
-                'Obsolete.',
-                'Use the alpha channel in error bar `color` to set the opacity.'
-            ].join(' ')
-        }
-    }
 };

src/plot_api/helpers.js

@@ -283,18 +283,6 @@ exports.cleanData = function(data) {
             delete trace.xbins;
         }
 
-        // error_y.opacity is obsolete - merge into color
-        if(trace.error_y && 'opacity' in trace.error_y) {
-            var dc = Color.defaults;
-            var yeColor = trace.error_y.color || (traceIs(trace, 'bar') ?
-                Color.defaultLine :
-                dc[tracei % dc.length]);
-            trace.error_y.color = Color.addOpacity(
-                Color.rgb(yeColor),
-                Color.opacity(yeColor) * trace.error_y.opacity);
-            delete trace.error_y.opacity;
-        }
-
         // convert bardir to orientation, and put the data into
         // the axes it's eventually going to be used with
         if('bardir' in trace) {