menu more and tools

- items: allow 'upg' to be an array
- filter: fixed logic error in checks
- Markup: prevent handling of [menu], as PageTemplate is nyi
- Power: advanced features (hide reagents or sellprice; recoloring,
  renaming, iconizing of links)
- search: side-icon for titles
- smarty: added template-vars to cache (has to be fixed sooner or later)

- identify as HTML5 (fixed a strange bug with displaced list-pegs)
- removed several typos

includes/types/basetype.class.php

@@ -672,7 +672,7 @@ abstract class Filter
 
             if (is_array($v) && !empty($v))
                 $_[$k] = $k.'='.implode(':', $v);
-            else if ($v === '')
+            else if ($v !== '')
                 $_[$k] = $k.'='.$v;
         }