This directory contains test classes for 
communicators. In fhe following the number
of nodes needed and some explanations are annotated:


class                  no. of nodes (min-max)           annotation
------------------------------------------------------------------
attr                        1-inf    
commdup                     1-inf
compare                     1-inf
intercomm                   2-inf                       even number
                                                        not impl.
split                       2-inf                       even number
