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Release a runtime license token for the external solver.
The eplex-library interfaces to an external simplex/MIP solver
which might require a license to run (e.g. CPLEX, XPRESS-MP, Gurobi).
When the eplex-library is loaded, it tries to obtain a license
immediately, or a license can be obtained by calling
lp_get_license/0. A held license can then be released using
lp_release_license/0. The predicate always succeeds, even
if no license was held.
lp_get_license / 0, lp_get_license / 2