Quick fix

I missed the version numbers in the **/internals.py files, and I noticed
a variable name misspell in the **/__main__.py files.

Toolchain updates

Upgrading from old-style setup.py system to pyproject.toml.

Also reworked the Makefile significantly.

Refactored algorithms + improved documentation

Refactored into package, to use gap argument parser; Remade build system