hdf5_der

[svn-r22898] Purpose:
	Updates the SWMR testing
	- All readers/writers now consume and emit their random seeds
	  for debugging.
	- Output uses unbuffered I/O for more readable output.
	- The random seeds are now based on a more fine-grained time
	  measurement to ensure each reader has a different random
	  seed.

Tested on:
	jam