add checking if there are more than one record variable

git-svn-id: https://svn.mcs.anl.gov/repos/parallel-netcdf/trunk@1765 c368ceb8-fd28-0410-a457-e46ee1d7cd4a
ncp is needed for checking if there are more than one record variable

git-svn-id: https://svn.mcs.anl.gov/repos/parallel-netcdf/trunk@1766 c368ceb8-fd28-0410-a457-e46ee1d7cd4a