Improve output: distinguish between failed assertions (failures) and unexpected exceptions (errors), and print a filtered stack trace for any exception.

webapp/web/templates/error/error404.jsp

@@ -0,0 +1,18 @@
+<%-- $This file is distributed under the terms of the license in /doc/license.txt$ --%>
+
+<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
+<%@page isErrorPage="true" %>
+
+<% if ( pageContext.getErrorData().getRequestURI().indexOf("/images/") < 0 ) {
+    request.setAttribute("bodyJsp", "/templates/error/error404content.jsp");
+    request.setAttribute("title", "Not Found");
+%>
+
+<jsp:forward page="/templates/page/basicPage.jsp">
+  <jsp:param name="uriStr" value="${pageContext.errorData.requestURI}"/>
+</jsp:forward>
+
+<% } %>
+
+
+