SWP deleted. Lists and Main extended
Newtonian sqrt in two ways.

Improved uses blocks and scoping - nicer, when you compare both.
Course files for 2nd week assignment.
First two hurdles cleared.

Singleton sets done.
Singleton sets done PROPERLY. With indicator function, not just
returning true for everything. Tests added for more.
2nd week - 8/10 points.

Basic functions - all.
Advanced - qualificators.

Podstawowe operacje na zbiorach, plus kwantyfikatory (niecałe).

Brak mapy. Filtrowanie jest.

Nie tak dużo testów jakbym chciał.
Course files for week 3 - object sets.