Add support for upcoming Libxc 5.1 and remove support for Libxc 5.0

Micael Oliveirarequested to merge
libxc_5_1_support into develop

Description

Add support for upcoming Libxc 5.1. Unfortunately Libxc 5.0 has some annoying bugs that can change some results and breaks some Octopus tests, so I'm disabling support for it. That means that the supported versions of Libxc are now all the Libxc 4 releases and the Libxc >= 5.1.0 releases.

News snippet

Add support for upcoming Libxc 5.1 and remove support for Libxc 5.0.

Checklist

  • I have checked that my code follows the Octopus coding standards
  • I have added tests for all the new features added in this request.

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