Document Printer_ConfigForm. Factor out form controls to printer.

git-svn-id: http://htmlpurifier.org/svnroot/htmlpurifier/trunk@1106 48356398-32a2-884e-a903-53898d9a118a

smoketests/configForm.php

@@ -67,10 +67,6 @@ $printer = new HTMLPurifier_Printer_ConfigForm('?doc');
 echo $printer->render($config);
 
 ?>
-<div style="text-align:right;">
-    <input type="submit" value="Submit" />
-    [<a href="?">Reset</a>]
-</div>
 </form>
 <pre>
 <?php