Switch to side-by-side view

--- a/Allura/allura/templates/widgets/markdown_edit.html
+++ b/Allura/allura/templates/widgets/markdown_edit.html
@@ -1,3 +1,21 @@
+{#
+       Licensed to the Apache Software Foundation (ASF) under one
+       or more contributor license agreements.  See the NOTICE file
+       distributed with this work for additional information
+       regarding copyright ownership.  The ASF licenses this file
+       to you under the Apache License, Version 2.0 (the
+       "License"); you may not use this file except in compliance
+       with the License.  You may obtain a copy of the License at
+
+         http://www.apache.org/licenses/LICENSE-2.0
+
+       Unless required by applicable law or agreed to in writing,
+       software distributed under the License is distributed on an
+       "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+       KIND, either express or implied.  See the License for the
+       specific language governing permissions and limitations
+       under the License.
+#}
 {% import 'allura:templates/jinja_master/lib.html' as lib with context %}
 <div class="markdown_edit">
   <a href="#" class="markdown_preview btn" title="Preview"><b data-icon="{{g.icons['search'].char}}" class="ico {{g.icons['search'].css}}"></b> Preview</a>