Change protocol version (3 -> 4) : PKDBF2 is renamed in PBKDF2. This also avoid mismatch with new encryption system

server/_user

@@ -59,7 +59,7 @@ function load_database()
     return $db;
 }
 
-$PROTOCOL_VERSION = 3;
+$PROTOCOL_VERSION = 4;
 
 $db = load_database();
 
@@ -68,8 +68,10 @@ $res = "";
 $statement = $db->prepare("SELECT password FROM gpass WHERE login=:login");
 
 echo "protocol=gpass-$PROTOCOL_VERSION\n";
-if ($PKDBF2_LEVEL != 1000)
-    echo "pkdbf2_level=$PKDBF2_LEVEL\n";
+if ($PBKDF2_LEVEL != 1000)
+{
+    echo "pbkdf2_level=$PBKDF2_LEVEL\n";
+}
 
 for ($i=0; $i<$MAX_PASSWORDS_PER_REQUEST && isset($_POST["k$i"]); $i++)
 {