* sendQueue is a pipe.
* receiveQueue is a B-tree.
* recv_sync mode yields packet that are due.

Use two timestamp tables to distinguish between data and redundancy
packets.

 - Implement PrrtTimestamp data structures and functions
 - Add PrrtTimeStampClock and PrrtTimeStampCycle macros where desired
 - Dump timestamp results to stdout

avoid the memory allocation, if wanted.

* Refactor dataReceiver.
* Add packetTimeoutTable.
* Add repairBlockStore.

Distinguish between delay and app layer latency in evaluation scripts.