Pymarl branch

[PaLeroy]

This PR will be accepted once:

• Everything can be executed properly from the root.
• A script to retrieve seed of any algo_env config.
• A step by step guide to reproduce experiments has been created.

[PaLeroy]

TODO:

• merge the seed scripts
• Execute the whole instructions to ensure no remaining errors.

[moratodpg]

I added a couple of minor comments. I understand we have to further test this before merging.