User module patch by Kjartan: - Optimized user_external_load(), only need to fetch the data once. - Removed unused functions: user_get() user_set() theme_menu_list() - Fixed user_validate_name() to not accept \. - Modified user_validate_name() to use alnum, which varies depending on the system locale. - Optimized user_validate_name() to not use unnecessary regular expressions. - Optimized user_access() by using less logic to fetch permissions and cache. - Removed uncessary logic from user_deny(). - Fixed user_fields() to properly cache $fields. - Optimized user_set_authmaps() to not perform unnecessary queries. - Removed return value from user_set_authmaps().
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