Fix bug in lib settings/Setting::item(): Now will return $default_value if item not found
Update core/Admin_Controller to set theme if 'theme' is key in $_GET
Fix bug in lib ICF_Form_validation:

Ext-callbacks produced error of inaccessible property $this->_module_callbacks[$module] if $module was not existant
Update lib acl/Acl methods Acl::{member_add,member_remove}
Add events for module acl to listen for user-registration
Update Events_Acl::register() to new argument order
For the time being, remove filters from admin/users
Slight speed improvement in model users/user_m
Update lib users/Auth::register to auto-generate passwords
Update theme view users/huraga/admin/_form to properly set checkbox value