Spack installation support

[fluidnumerics-joe]

I'm working on getting FTObjectLibrary added as a package in the Spack package manager project and want to see how (and if) you would like spack installation instructions included in this repository.

If you're not familiar with Spack, you can learn more about spack at https://spack.io

The relevant pull request for Spack is here : spack/spack#24423

Essentially spack provides an easy method for installing scientific/HPC packages from source code while managing dependencies. To install via spack, after someone downloads spack, they can simply run

spack install ftobjectlibrary

which uses this repo's CMake build system to install FTOL.

I'm interested in hearing this team's thoughts.

[sloede]

If it is really just this one-liner that is relevant for the user to consider, I'd recommend to put it into the main README.md, since this is where a potential user would look first for this information.

Do you plan on registering HOHQMesh with spack as well once FTObjectLibrary is installable this way?

[fluidnumerics-joe]

Yes. Once FTOL is accepted by Spack, I'll be adding HOHQMesh.

[sloede]

Yes. Once FTOL is accepted by Spack, I'll be adding HOHQMesh.

Great, this will make it much easier to distribute it! Maybe you can also add testing to spack, if that's supported, using the new -test option in HOHQMesh.