[dmeoli]

smspp_ucblock_solver reads, when no -B is given, the BlockConfig InnerBCfg.txt from the -c folder, which pySMSpp sets to the folder of the BlockSolverConfig; the UCBlock folder had none, so a UCBlock with a PolyhedralFunctionBlock (e.g., the future value of the water of the HydroSystemUnitBlock that pypsa2smspp writes with hydro_system=True) was solved with the function in its natural form, which a :MILPSolver cannot handle, and the tool failed.

The folder now ships InnerBCfg.txt, a map from classname to BlockConfig whose only entry puts the PolyhedralFunctionBlock in its linearized form (PFBCfg.txt, the same file as in the TSSBlock folder of #116). Every other sub-Block keeps the formulation it is deserialized with, so the instances without a PolyhedralFunctionBlock are solved as before: the 23 cases of test_ucblock.py of pypsa2smspp without hydro units pass with and without the file, and the 2 hydro cases with hydro_system=True pass with the default template (with the optimum of PyPSA, 2.9533401e10 and 1.5550488e9) and fail without it. The new test checks that the folder carries the file with that entry only.

The two-stage case needs no change here: smspp_tssb_solver reads TSSBCfg.txt by default, and the TSSBlock/InnerBCfg.txt of #116 already has the PolyhedralFunctionBlock entry, to be given with B="InnerBCfg.txt".