Add the OPAMSOLVERTOLERANCE environment variable to allow users to fix solver timeouts for good #5510
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This was referenced Apr 14, 2023
Add the ?mip_gap parameter that allows unoptimized solutions to be returned
ocaml-opam/ocaml-mccs#40
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…x solver timeouts for good
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Partially fixes #5504
Partially fixes #3447
Partially fixes #5353
Partially fixes #4794
Fixes #3230
Requires ocaml-opam/ocaml-mccs#40
Optimizing solvers can be an annoying breed, sometimes a problem is just too complex for solver A but easy for solver B, and on some other problem solver B might take too long where solver A takes no time at all.
To partly solve the numerous timeout issues that have been plagued opam, I introduce this new environment variable that allows
builtin-mccs+glpk(default solver) to not wait around for too long when it found a solution but the solution is not the optimum solution.The downside of having unoptimized solutions is that opam might install out-of-date packages so it is to be used parsimoniously.
TODO: add teststoo complicated to do reliably