Add support for no-password mode

edit_user.cgi

@@ -716,11 +716,16 @@ else {
 			}
 		else {
 			# For an existing user, offer to change password
-			$pwfield = &ui_opt_textbox("mailpass", undef, 13,
-				$text{'user_passdef'}."\n".
-				(defined($user->{'plainpass'}) ?
-				&show_password_popup($d, $user) : ""),
-				$text{'user_passset'});
+			$popup = defined($user->{'plainpass'}) ?
+					&show_password_popup($d, $user) : "";
+			$mode = $user->{'pass'} eq '*' ? 2 : 1;
+			my @opts;
+			push(@opts, [ 1, $text{'user_passdef'}.$popup."<br>" ])
+				if ($mode != 2);
+			push(@opts, [ 2, $text{'user_passnone'}."<br>" ],
+				    [ 0, $text{'user_passset'}." ".
+				         &ui_textbox("mailpass", undef, 20) ]);
+			$pwfield = &ui_radio("mailpass_def", $mode, \@opts);
 			if ($user->{'change'}) {
 				local $tm = timelocal(gmtime($user->{'change'} *
 							     60*60*24));

lang/en

@@ -871,6 +871,7 @@ user_surname=Surname
 user_real=Real name
 user_pass=Password
 user_passdef=Leave unchanged
+user_passnone=No password accepted
 user_passset=Set to ..
 user_recovery=Password recovery address
 user_norecovery=None set

save_user.cgi

@@ -199,10 +199,17 @@ else {
 		$in{'real'} =~ /^[^:\r\n]*$/ ||
 			&error($text{'user_ereal'});
 		$user->{'real'} = $in{'real'};
-		if (!$in{'new'} && $in{'mailpass_def'}) {
+		if (!$in{'new'} && $in{'mailpass_def'} == 1) {
 			# Password not being changed
 			$user->{'passmode'} = 4;
 			}
+		elsif ($in{'mailpass_def'} == 2) {
+			# No passwored accepted
+			$need_password_check = 0;
+			delete($user->{'plainpass'});
+			$user->{'pass'} = '*';
+			$user->{'passmode'} = 1;
+			}
 		else {
 			# Either password is being changed, or this is new user
 			$user->{'plainpass'} =