Libkit Python Port

At commit 76ef582da88f, this repo introduced a Python port of libkit. It’s a mock of libkit.sh with some differences:

1. Python is already portable enough, so no need to split platforms for it (actually needed, but that makes importing suck, so I dropped it).

2. All platform directories, like ubuntu and darwin, contain a libkit.py symlink to posix/libkit.py. This is by design, for better consistency with libkit.sh.

3. No platform-dependent work. If you want to do that, go the fuck use libkit.sh. Python doesn’t suit you.

4. Provides shell function aliases.

To use this port, symlink libkit.py in the same directory as your script importing it, to this/repo/current/libkit.py.

You must set up current/ via ./<consumer>/setup.sh set-current. See Use Setup Script for script usage.