Added categories and Filter widget

templates/layouts/default.html.ep

@@ -39,7 +39,7 @@
 % }
 % if ( defined $sql ) {
 <div class="targettable" id="sql">
-<p>In case you are interested, this is what is executed in the database in order to process your request and to render this page. All essential logic and consistency checking is done on database level via triggers and views, so you could execute these SQL statements e.g. in the console and would get the same results. Note that, if any POST requests redirected here, SQL commands of those come first:</p>
+<p>Please note that, to run the SQL commands directly in another tool, you might need to resolve the prepared statements manually. Just replace all question marks by the values listed after the colon in each line.</p>
 <textarea rows="5" style="width:100%;border:1px inset lightgrey;" readonly="readonly">
 %== $$sql
 </textarea></div>