add non-equals for filters; do not prepopulate transforms

Author: dmt0

src/components/containers/TransformAccordion.js

@@ -97,12 +97,11 @@ class TransformAccordion extends Component {
               const key = `transforms[${transformIndex}]`;
 
               const payload = {type};
-              const firstDataSource = dataSourceOptions[0].value;
               if (type === 'filter') {
-                payload.targetsrc = firstDataSource;
+                payload.targetsrc = null;
               } else {
-                payload.groupssrc = firstDataSource;
-                payload.groups = dataSources[firstDataSource];
+                payload.groupssrc = null;
+                payload.groups = null;
               }
 
               updateContainer({[key]: payload});

src/components/fields/FilterOperation.js

@@ -30,6 +30,7 @@ const operators = [
 
 const operations = {
   inequality: [
+    {value: '!=', label: 'Target ≠ Reference'},
     {value: '<', label: 'Target < Reference'},
     {value: '<=', label: 'Target ≤ Reference'},
     {value: '=', label: 'Target = Reference'},