[Tree] Show root for most trees

Modify tree so that it includes its root in most cases, for
WTD-922.

platform/commonUI/general/bundle.json

@@ -151,6 +151,12 @@
             {
                 "key": "tree",
                 "templateUrl": "templates/tree.html",
+                "type": "root",
+                "priority": "preferred"
+            },
+            {
+                "key": "tree",
+                "templateUrl": "templates/subtree.html",
                 "uses": [ "composition" ]
             },
             {

platform/commonUI/general/res/templates/subtree.html

@@ -0,0 +1,14 @@
+<ul class="tree">
+    <li ng-if="!composition">
+        <span class="tree-item">
+            <span class="icon wait-spinner"></span>
+            <span class="title-label">Loading...</span>
+        </span>
+    </li>
+    <li ng-repeat="child in composition">
+        <mct-representation key="'tree-node'"
+                            mct-object="child"
+                            ng-model="ngModel">
+        </mct-representation>
+    </li>
+</ul>

platform/commonUI/general/res/templates/tree.html

@@ -1,13 +1,7 @@
 <ul class="tree">
-    <li ng-if="!composition">
-        <span class="tree-item">
-            <span class="icon wait-spinner"></span>
-            <span class="title-label">Loading...</span>
-        </span>
-    </li>
-    <li ng-repeat="child in composition">
+    <li>
         <mct-representation key="'tree-node'"
-                            mct-object="child"
+                            mct-object="domainObject"
                             ng-model="ngModel">
         </mct-representation>
     </li>