Append functionality added to the CodePlex BizTalk SFTP adapter

I love this adapter. Great work by Mikael Håkonsson and Johan Hedberg on something that Microsoft should have included as part of what comes in the box. 

While working for a client in Norway, we needed the option of doing append. We looked at the Nsoftware SFTP adapter and it looked pretty solid, but little peeking around, and a days work later I added Append functionality to the adapter.  This functionality already existed in the SSHSharp library, so it was just a matter of adding a property to the adapter, and following the call through the layers and adding stuff along the way. Not as hard as I had expected. But I am in NO hurry to start writing adapters from the ground up ...

I emailed Mikael about getting it into the Codeplex codebase, but if anybody needs it before that might happen, please let me know.