API: strange civicrm_group_add() required $params

civicrm_group_add() requires 'name' and 'id' to be passed in as params. It would be more natural to pass it the 'title', and moreover, CRM_Contact_BAO_Group::create() turns the title into a name and creates a new id.

Changing api/v2/Group.php to require only a title leads to a fatal 'CRM_Utils_String not found' error @ line 311 of CRM/Contact/BAO/Group.php that is remedied by adding require_once 'CRM/Utils/String.php' immediately above.