WebService for uploading data transactions.

The following operations are supported. For a formal definition, please review the Service Description.

• FinishChunkUpload
  Call to finish file upload, returns the error colletion if errored, nothing if successful.
• StartChunkUpload
  Call to start file upload, returns -1 if the file is already completely uploaded and MD5 verified, or the offset if only partially uploaded.
• UploadChunk
  Call to upload a file chunk, return boolean indicating success.