Second pass at adding key files

site/forum/include_content_header.html

@@ -0,0 +1,43 @@
+<div class="page-header">
+  <div class="clearfix">
+    <h1><%content_header_title || 'Forum'%></h1>
+    <%~if post_toolbar%>
+    <%include include_post_toolbar.html%>
+    <%~else%>
+    <%include include_forum_actions.html%>
+    <%~endif%>
+  </div>
+  <hr class="line" />
+</div>
+
+<%~if errors.length%><%set error_loop = $errors%><%endif%>
+<%~if success or success_loop.length%>
+  <div class="message<%unless error or error_loop.length or welcome%> last<%endunless%>">
+    <ul>
+    <%~if success starts '<li>'%>
+      <%success%>
+    <%~elsif success%>
+      <li><%success%></li>
+    <%~endif%>
+    <%~loop success_loop%>
+      <li><%loop_value%></li>
+    <%~endloop%>
+    </ul>
+  </div>
+<%~endif%>
+<%~if error or error_loop.length%>
+  <div class="error<%unless welcome%> last<%endunless%>">
+    <ul>
+    <%~if error starts '<li>'%>
+      <%error%>
+    <%~elsif error%>
+      <li><%error%></li>
+    <%~endif%>
+    <%~loop error_loop%>
+      <li><%loop_value.error || $loop_value%></li><%-- error_loop values containing an 'error' key are used by GForum in some places, which were implemented before loop_value existed --%>
+    <%~endloop%>
+    </ul>
+  </div>
+<%~endif%>
+
+<%include include_forum_rules.html%>