Tree structure of the project

The project is started with a ./src/ repository where entities are added. It was rather proposed to have all the project code here (estimator, controller, etc). A tree structure should be created to order that amount of code. @gbuondon and @fforget have proposed to work together to build it.

added under review label

This task is achieved, right? Somebody closes it pls.

@nmansard can you accept my pull request first? This way the tree structure will be merged to master (I cannot accept it myself because self-approving pull requests is not allowed, apparently). When it's done, we can close this issue

I don't receive notif for merge-request, apparently. We should add them manually to the issue.

closed

mentioned in commit ee3d756e