Add support for Libxc 5
Description
This MR adds support for the upcoming Libxc 5. To make this simpler to implement and maintain, now Octopus uses the Fortran 2003 interface of Libxc for all versions.
News snippet
Add support for upcoming Libxc 5.
Checklist
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I have checked that my code follows the Octopus coding standards -
I have added tests for all the new features added in this request.
Closes #287 (closed)
Edited by Micael Oliveira