[Mpi-21] Change-Log entry is missing: Version number changed to 2.1

See https://svn.mpi-forum.org/trac/mpi-forum-web/wiki/mpi22/Change-log-2.1-versi... I hope, that all implementers of MPI-2.1 detected this change already without this Change-Log entry ;-) Best regards Rolf Dr. Rolf Rabenseifner . . . . . . . . . .. email rabenseifner_at_[hidden] High Performance Computing Center (HLRS) . phone ++49(0)711/685-65530 University of Stuttgart . . . . . . . . .. fax ++49(0)711 / 685-65832 Head of Dpmt Parallel Computing . . . www.hlrs.de/people/rabenseifner Nobelstr. 19, D-70550 Stuttgart, Germany . (Office: Allmandring 30)