* sadu/ticket/10561:
[ticket/10561] Removed extra tabs, changes made to $db->sql_query()
[ticket/10561] Changed $temp_style_id to $style_id
[ticket/10561] Added function desc for phpbb_style_is_active()
[ticket/10561] Casted $config['default_style'] to int
[ticket/10561] Reverted to phpbb_style_is_active()
[ticket/10561] Added to database_update:database_update_info()
[ticket/10561] Added section in database_update.php
[ticket/10561] Moved and renamed the funtion validate_style().
[ticket/10561] Fixed syntax error and renamed return variables.
[ticket/10561] Changes made to $db->sql_fetchrow().
[ticket/10561] Changes made to function phpbb_style_is_active().
[ticket/10561] All users can choose deactivated styles (fixed).