Added permissions system to control page

static/main/js/control.js

@@ -0,0 +1,9 @@
+"use strict";
+let checkboxes = document.getElementsByName("users");
+let fields = document.querySelectorAll(".checkbox_field");
+if (checkboxes.length == fields.length) {
+  for (let i = 0; i < fields.length; ++i) {
+    let el = checkboxes[i].cloneNode(true);
+    fields[i].appendChild(el);
+  }
+}