 BSPlib   vs  MPI  for broadcasting.

MPILibrary is MPI_Bcast
MpiBrdcast is my mpibcast
2-phaseBRD is my two-phase implementation
TreeBroadc is the tree-based implementation
DecideBest is my optimized function that decides itself the best
              function between 2-phaseBRD and TreeBroadc and the
              appropriate parameters (eg. deg in the latter).
              Input parameter Deg is thus ignored.

