MDL-30168 formslib: untangle automatic id generation.

Previously, we had overridden the _generateId method in almost all
subclasses; and then we mostly, but not always; ignored the value that
was generated there, and instead generated new (nicer) values in
MoodleQuickForm_Renderer::renderElement. Of course, that is not really a
logical place to (re)generate ids.

I have fixed the code so that the _generateId method now uses the 'nice
id' algorithm from renderElement. This should make the whole code flow
more logical.

This make all our overriding of _generateId unnecessary.

We do need a special _generateId for radio buttons, because you often
have different radio buttons with the same name but different values.

This change should only change the ids on radio, checkbox and
advcheckbox elements. Previously, those were essentially random, so I
don't think anyone could have been relying on the particular values.

This commit also has new unit tests, first to test the basic _generateId
algorithm, and then to create and render an example form (including some
tricky things like repeat_elements) and chech the acutal ids in the
generated HTML.

lib/form/selectgroups.php

@@ -548,24 +548,6 @@ class MoodleQuickForm_selectgroups extends HTML_QuickForm_element {
     function setHiddenLabel($hiddenLabel){
         $this->_hiddenLabel = $hiddenLabel;
     }
-   /**
-    * Automatically generates and assigns an 'id' attribute for the element.
-    *
-    * Currently used to ensure that labels work on radio buttons and
-    * checkboxes. Per idea of Alexander Radivanovich.
-    * Overriden in moodleforms to remove qf_ prefix.
-    *
-    * @access private
-    * @return void
-    */
-    function _generateId()
-    {
-        static $idx = 1;
-
-        if (!$this->getAttribute('id')) {
-            $this->updateAttributes(array('id' => 'id_'. substr(md5(microtime() . $idx++), 0, 6)));
-        }
-    } // end func _generateId
     /**
      * set html for help button
      *