* rnpletal: New package
RNPL is an old package that is still used today by my collaborators, but doesn't see any development any more. I'm creating a Spack package merely to make it easier to install it on various systems. The code is not modern (C without prototypes – yes, that used to be a thing), and a large diff modernizes the code to make it palatable to modern C and Fortran compilers.
RNPL contains several sub-package. The current Spack package builds only the main one.
* rnpletal: Remove unused import
* Convert into AutotoolsPackage
* Don't check for "shared" variant
* rnpletal: Change "version" to `develop`
* rnpletal: Use existing `configure` function
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