NCF-324 - Don't reopen HDF5 dataset if it's already open (in particular when the variable name is the same as a dimension name).
NCF-324 - Don't reopen HDF5 dataset if it's already open (in particular when
the variable name is the same as a dimension name).

Unidata/netcdf-c,Unidata/netcdf-c,Unidata/netcdf-c,Unidata/netcdf-c