add new API ncmpi_inq_recsize() and test programs

git-svn-id: https://svn.mcs.anl.gov/repos/parallel-netcdf/trunk@1813 c368ceb8-fd28-0410-a457-e46ee1d7cd4a
fixed-size or fixed-sized

git-svn-id: https://svn.mcs.anl.gov/repos/parallel-netcdf/trunk@1814 c368ceb8-fd28-0410-a457-e46ee1d7cd4a