Changes in tests and tasks:
- All tests have been changed so that to the left of == assert is the correct version of the output, and to the right is the output from the task. Thus, pytest-clarity shows in green the correct option, in red what is received from the task
- Updated pyneng utility and pytest.ini config files - removed pytest option due to pytest-clarity update
- updated tasks, most of them small changes, clarification of the wording
- removed task: 15.2a
- Updated pyneng_common_functions.py file in exercises directory