* added dibi::date & dibi::datetime

* DibiConnection::insertId && affectedRows throws exception on failure
* added protected throwException() to drivers
* DibiPostgreDriver - can build connection string
* DibiSqliteDriver - support for parameters 'format:date' & 'format:datetime'
* fixed query errors in DibiSqliteDriver
* DibiConnection prevents serialization and multiple transactions

dibi/libs/NException.php

@@ -74,7 +74,7 @@ class NException extends Exception
     /**
      * Returns string represenation of exception
      *
-     * @return void
+     * @return string
      */
     public function __toString()
     {