Fix rebound on mac

[adamdempsey90]

Background

This should fix the linking issues on mac. Essentially we don't try in cmake, and instead just run install_name_tool after the build completes to set the @rpath in the binary directly. Because of this change, we also no longer need to move librebound.so after building it, so I got rid of that step too.

With this, I can now successfully execute artemis from anywhere and move the binary anywhere and execute it.

I also added the -Wno-deprecated-declarations to suppress the warnings from singularity.

Description of Changes

Checklist

• New features are documented
• Tests added for bug fixes and new features
• (@lanl.gov employees) Update copyright on changed files

[pdmullen]

Just tested this locally on my mac (via disk_collisions.in) and it worked! Nice find (albeit I have no idea what this new cmake nonsense is actually doing...)