Created the file 'test_suite/runner.py' for the execution of all categories of tests
(system/functional and unit tests).
Added an '__init__.py' file to the 'unit_tests' directory to allow import of the modules.
Renamed the file 'test_suite/system_tests/test_suite.py' to 'test_suite/system_tests/main.py'.
More changes will be necessary to remove all references in the system/functional tests to the test
suite.