Steffan Schlein

Remove Variable objects from variable data

2

The Python `Variable` objects created by [`Model.addVar()`](https://github.com/scipopt/PySCIPOpt/blob/0485fdb17851749a80ca6254d1e9cc01e44c2c95/src/pyscipopt/scip.pyx#L1415) are stored as user data in the SCIP data structure: ```python SCIPvarSetData(scip_var, pyVar) ``` In addition, in the same function the `Model` class...