Structure change

[AlejandroMC28]

Changed structure of the package(added classes for food counts and food flows), added visualization, utilities and testing

[bittremieux]

Can you remove the __pycache__/ directories from the PR?

I recommend using a good global .gitignore file to avoid checking in such unnecessary files.

[AlejandroMC28]

Removed cache files and added a .gitignore file

[bittremieux]

Nice work. I left a few comments to mainly update some of the code style a bit. Note that some of these comments re-occur in a few different places but I haven't marked all of them, so go through the code with them in mind.

[AlejandroMC28]

Resolved all comments, updated the base algorithm of food counts computation.

[bittremieux]

The code is starting to look very nice, good job. I have one main concern, and that's the addition of several big(ish) sample files used for testing. This should ideally be avoided, see the comment in the code.

[AlejandroMC28]

Solved previous comments, and 8/11 issues. Issues remaining are to add changelog, documentation and contributing guidelines