Add "monolithic.py" way to provide exercices
- UPD - Reorganize the macros python package
- ADD - Introduce a third way to feed the macros with files/data (all python codes in the same file)
- ADD - Redirection of stdout and stderr when running HDR content
- FIX - Enforce prepending the original public tests before the secret tests
- UPD - store internally the public tests separately from the user's code
Modification effectuée par Frederic Zinelli