- make `GF2`, `one`, and `zero`, defined in the `lalib.elements.gf2`
module, available as top-level imports in the `lalib.elements`
sub-package via `from lalib.elements import *`
- provide some code snippets in the sub-package's docstring
- test the star import
- add `GF2` class in the `lalib.elements` sub-package
implementing a typical Galois field with two elements
- the singleton objects `one` and `zero` are the concrete
instances of the `GF2` type for the end users
- besides the typical Galois arithmetic, `one` and `zero`
behave like the built-in numbers `1` and `0`
and implement the `numbers.Rational` interface
- add exhaustive docstrings with usage examples
- add (unit) test cases with 100% coverage