use ldap_set_rebind_proc() to provide auth when rebinding following
ldap referrals (instead of rebinding anonymously for ldap referrals)
"LDAP authentication vs. AD: problems with referrals"
More specific checks on contents of array lists. Each module using
lists now does better checking on the types of values in the list
(strings, integers, arrays/lists)
This helps prevent misconfiguration of things like cgi.assign,
fastcgi.server, and scgi.server, where source code might be
served as static files if parenthesis are misplaced.