Sample IO routines showing the slow and fast way to do IO

tar ball of C and Fortran IO sample programs.

C streams example - uses setvbuf to increase performance. One file per node.

C stdio example - uses async IO routines to increase performance. One file per node.

C shared file example - uses yod '-masync' parameter and async IO routines to increase performance when all nodes are reading/writing to one file.

f90 async IO example - uses async IO routines to increase performance. One file per node.

f90 async IO/shared file example - uses 'yod -masync' parameter and async IO routines to increase performance.