v2.4.7

Sub-Groups added & some enhancements

• added function add_subgroup($group_par, $subgroup_par)
• added function remove_subgroup($group_par, $subgroup_par)
• added function get_subgroups($group_par)
• modified is_group_allowed() to check subgroups
• modified delete_group() to remove subgroups
• added 2 lines for subgroups to english/aauth_lang.php
• added a new table to the database group_to_group
• changed verstion from 2.4.6 to 2.4.7
• verification email sending disabled if a admin is creating a user (#119 improved with @vipinks)
• fixed Quick Start-Section (changed deny to deny_group) (found by #118)
• renamed valid_chars to additional_valid_chars (suggestion by #125)
• added function get_user_vars($user_id) (suggestion by #129)