Add support for database format 3.01 (HeaderHash).

Add test for the format 3.00 and upgrade Compressed.kdbx, NonAscii.kdbx
and ProtectedStrings.kdbx to 3.01.

Add a test for an incorrect HeaderHash.

src/format/KeePass2Reader.h

@@ -54,6 +54,7 @@ private:
     void setInnerRandomStreamID(const QByteArray& data);
 
     QIODevice* m_device;
+    QIODevice* m_headerStream;
     bool m_error;
     QString m_errorStr;
     bool m_headerEnd;