A bug which we fix here and there by sending the string '0' instead.
We will be able to remove these hacks ("booleanintstring") when the
next release of DB_DataObject comes as I patched it for them.
lib/plugin.php now has a parent onAutoload function that finds most common
files that are used in plugins (actions, dataobjects, forms, libs etc.) if
they are put in the standardised directories ('actions', 'classes', 'forms',
'lib' and perhaps some others in the future).