vchoi_fork

[svn-r4690] 
Purpose:
	Feature Fix
Description:
	Added code so that it measures the time it takes to do I/O and return
	that to the calling function.

	This code doesn't quite work yet. There is something wrong with the
	MPI code in the "pio_engine.c" file...I don't know what's up with
	it...
Platforms tested:
	Linux