Update README

git-svn-id: https://svn.mcs.anl.gov/repos/parallel-netcdf/trunk@1846 c368ceb8-fd28-0410-a457-e46ee1d7cd4a
match netCDF's ncdump on type indicator

git-svn-id: https://svn.mcs.anl.gov/repos/parallel-netcdf/trunk@1847 c368ceb8-fd28-0410-a457-e46ee1d7cd4a
Update README

git-svn-id: https://svn.mcs.anl.gov/repos/parallel-netcdf/trunk@1848 c368ceb8-fd28-0410-a457-e46ee1d7cd4a