Revert "Squash 10 first migrations of Base."
Revert "Squash 10 first migrations of Base."

This reverts commit 79b22000

uclouvain/osis,uclouvain/osis,uclouvain/osis,uclouvain/OSIS-Louvain,uclouvain/osis,uclouvain/OSIS-Louvain,uclouvain/OSIS-Louvain