visgraph: improve splitId(node_id,'id') : return always integer

node_id value examples:
* 'accompanying_period_124' --> 124
* '124' --> 124
* 124 --> 124

src/Bundle/ChillPersonBundle/Resources/public/vuejs/VisGraph/App.vue

@@ -237,6 +237,11 @@ export default {
             let nodeType = splitId(data.nodes[0], 'type')
             switch (nodeType) {
 
+            // test
+            console.log(
+               splitId('accompanying_period_124', 'id')
+            )
+
                case 'person':
                   let person = this.nodes.filter(n => n.id === data.nodes[0])[0]
                   console.log('@@@@@@ event on selected Node', person.id)