pkg-config files for all Debian (science) packages

This release goal (your challenge if you accept it) is for each library / dev package to provide a pkg-config file capable of resolving all the dependencies needed to build with the library.

I'm doing this for Debian Meteorology to start with; this requires enabling pkg-config for dependencies too.

pkg-config --libs ncl for example.

See also: DebianScience/LinearAlgebraLibraries