[development] checkboxes change

[Karoly Negyesi]

Hi!

I am sorry to introduce a change so late in the game but checkboxes type  
(not singular) default values needed an overhaul.

Currently you have #default_value => array(key1, key2, key3) and in #value  
you usually have array(key1 => 1, key2 => 1, key3 => 1) -- unless you  
submit the form with all checkboxes unchecked when #default_value will  
take over and you end up array(key1, key2, key3). This behaviour is not  
consistent, error prone -- other words, buggy.

http://drupal.org/node/39179 has a patch. Please test it throughly.

Regards

NK