Compatibility with Python 3.8
I had the bad idea to upgrade from Python 3.7 to Python 3.8
Unfortunately Pulp 1.6.8 is not compatible with Python 3.8
I moved to Pulp 2.1, which require a few modifications, but it works without much problems
There was also problems to install psycopg2 2.7.5 with pip, so I moved to the last version (2.8.5) and it was OK.
The status of the Merge Request is WIP because I didn't try the test.py, and I cannot test it with Gurobi
The merge request could be the opportunity to upgrade a lot of other things, like Django, numpy, etc.