improved database backend support for larger files (100 KiB - 16 MiB),

introduced database versioning to reduce amount of checks done per
request

tst/zerobin.php

@@ -184,6 +184,7 @@ class zerobinTest extends PHPUnit_Framework_TestCase
         $this->reset();
         $options = parse_ini_file(CONF, true);
         $options['traffic']['header'] = 'X_FORWARDED_FOR';
+        $options['traffic']['limit'] = 100;
         helper::confBackup();
         helper::createIniFile(CONF, $options);
         $_POST = helper::getPaste();