hdf5_der

[svn-r24398] 
The main implemetation for Read IO for multiple dataset with H5Dread_multi() in Parallel mode (collective and Independent IO) and Serial mode.  

Note:
Debugging code and extra code are still remained with ifdefs.
Extra code will be cleaned up at wrapping up stage later when all things work.
Debugging messages are turned off, so there is no debugging print outs when run
tests.