* TransportHeaders.cs: Added Serializable attribute.
* ClientChannelSinkStack.cs: Added no-param constructor.
* ContextAttribute.cs: Removed constructor.
* RealProxy.cs (GetProxiedType): Removed 'virtual' keyword.
* BinaryFormatter.cs (WriteBinaryHeader): changed from public to
private.
* Formatter.cs (WriteSByte): Added CLSCompliant attribute.
svn path=/trunk/mcs/; revision=16785