Changes for version 4.17
- Since netcdf-4.1, the netcdf-library changes the meaning of nc_sync from release internal buffers to make sure everything known is written to disk. This slows down writing a lot. PDL::NetCDF no longer calls nc_sync automatically (except on close). To ensure writing the file to the disk while keeping it open, $nc->sync is now provided.
- PDL::NetCDF in netcdf.pd