- add version 9.1.2
- set a license file
- set the license environment variable
- remove the download and license information out of the description so
it does not show up in environment modules
- extend python and set python version constraints
- build gurobipy to be used in any compatible python, used for more
extensive computations than the gurobi shell
- remove preexisting PYTHONPATH from gurobi.sh as the shell uses a
built-in python, which will likely be different from "system" python
- add maintainer
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