code refers to permission PERM_READ_LIST, which doesn't seem to be used actually.

dm removal branch svn://svn.zabbix.com/branches/dev/ZBXNEXT-1343 only lists :

./include/common.h: PERM_READ_LIST,
./src/libs/zbxcommon/str.c: case PERM_READ_LIST:
./frontends/php/include/perm.inc.php: if ($perm == PERM_READ_LIST) {
./frontends/php/include/defines.inc.php:define('PERM_READ_LIST', 1);

frontend matches it to read only right away, server maps it to "rl" that i dont know what it does
there doesn't seem to be code in frontend to actually set it at all.

upgrade patch potentially should change 1 to 2 in the 'rights' table