Support Octopus 14.0

[fangohr]

• add checksum and version for 14.0
• check it compiles fine
• once successful, put in merge request upstream in spack

[lang-m]

Do we want to switch to CMake for 14? According to the MRs listed in the release notes CUDA should (?) work.

[fangohr]

Do we want to switch to CMake for 14? According to the MRs listed in the release notes CUDA should (?) work.
I would propose a two-step approach:

1. make Octopus 14 available via spack, keeping autotools as the built utility. The main advantage here is that this should be a fast fix. That's what I had in mind for this issue.

2. make it possible to build octopus 14 with Cmake in Spack. This is the future, so it needs to happen, but it may be non-trivial, and take some time. (That's why I wanted to address point 1. first). I will create a second ticket for the CMake transition.

Is this a reasonable approach @lang-m , @iamashwin99 ?

[fangohr]

I have created the additional issue #104 for point 2.