LibPack 3.0.0 does not support building in DEBUG mode

[chennes]

Right now building the LibPack with the --mode=debug fails due to a set of issues. First and foremost, the pip install command needs to be modified to pull or compile debug versions of those packages. This is problematic for numpy, which requires a Fortran compiler. This Issue is intended as a catch-all to collect problems related to getting the debug-mode LibPack working.