HELLO_WORLD - Master process:
  A simple FORTRAN 90 program using MPI.
 
  The number of processes is   4
 
 
  Process   0 says "Hello, world!"
 
HELLO_WORLD - Master process:
  Normal end of execution: "Goodbye, world!".
 
  Process   1 says "Hello, world!"
 
  Process   2 says "Hello, world!"
 
  Process   3 says "Hello, world!"