feat: Add rpath and relocatable installs (!14)
Resolves #2 (closed)
blah blah. might need to bug Attila if I'm screwing it up, or if there's a way to pull in the ATLAS CMake into this properly
Commit message:
* Add install location support with CMAKE_INSTALL_LIBDIR and RPATH.
The install location is set by the user with with DESTDIR:
DESTDIR=<path to install into> cmake --install build