make successful runs print to stdout instead of stderr

git-svn-id: https://svn.mcs.anl.gov/repos/parallel-netcdf/trunk@1675 c368ceb8-fd28-0410-a457-e46ee1d7cd4a
add note on running make testing and ptest on cetus

git-svn-id: https://svn.mcs.anl.gov/repos/parallel-netcdf/trunk@1676 c368ceb8-fd28-0410-a457-e46ee1d7cd4a