hdf5_der

[svn-r24908] 
- Change so -p no longer takes <seconds> argument, just causes pause & wait for <return> to be entered before continuing
- Removed create_groups helper function & just do inline
- Cleanup of output so that it seems more readable for demo & also since it will be seen & not redirected for later analysis (because of <return> with -p)
- Misc other changes, hopefully to improve & make less suspectible to issues.

Note:  This version run  5 times on lower cluster on lola got hang; ok; hang; hang; ok.