.. to properly calculate receiver CPU frequency.

Pin worker threads to cores.

Use ts_redundancy_packet when appropriate.

Instead of the data packet.

The PrrtPacketTimeoutTable uses the timestamp as index, not the sequence
number.

This ensures that the cleaner runs right before it terminates.

Build everything with -std=c11.

avoid integer overflow

.. do not use _signal, it has some issues.

It is possible that the timeout value overflows, and then, the 'now'
timestamp is always larger than the packet timeout. We need a proper
timeout detection.