The upstream tarball is now maintained as a separate archive within
the .orig.tar.gz. It has to be saved in netcdf-<version>/upstream/ and the .orig tarball
needs to be crated running a command like:

tar czvf tarballs/netcdf-<version>/netcdf_<version>.orig.tar.gz netcdf-<version>

At build time, cdbs will create a build-tree/netcdf-<version> sub-tree in parallel
with the debian/ directory. Quilt can be as follows

cd build-tree/netcdf-<version> 
QUILT_PATCHES=$(pwd)/../debian/patches quilt <command>

i.e. you have to consider the build-tree as its root tree.
