Nitf.cs doesn't compile
I generated Ntif.cs with this command - 

`kaitai-struct-compiler-0.10\bin> .\kaitai-struct-compiler.bat -t csharp "kaitai-struct-compiler-0.10\formats\image\nitf.ksy"`

The resultant Ntif.cs doesn't compile with this error - 

```
(1527) : The type 'Kaitai.Nitf' already contains a definition for 'Header'
(1526) :         private KaitaiStruct m_parent;
(1527) : >>>         public Header Header { get {return _header; } }
```