* Optimize DecodeReader performance
* A little bit better locking in PieceBuffer.Write
* Fix race issues
* Better fix for race condition in rs_test.go
* Improve PieceBuffer.Read to read the max available in one call
* PieceBuffer.Skip for more efficient discarding of old shares
* Rename bytesRead to nn
* Notify cvNewData only if a complete new share is available
* Small correction in PieceBuffer.Read
* Rename some fields to have longer names
