v0.1.3

Changed

• HiGHS MIP backend tuning. Presolve is now left on by default even when a
  primal-start hint is supplied (previously forced off). simplex_scale_strategy=4
  is now the default for MIP LP solves. HiGHS MIP verbose logging is now gated by
  SURGE_HIGHS_VERBOSE (previously LP/QP only).

Added

• SURGE_HIGHS_* environment variables for tuning HiGHS without a rebuild:
  THREADS, PARALLEL, RANDOM_SEED, SIMPLEX_STRAT, SCALE_STRAT,
  PRIMAL_FEAS_TOL, DUAL_FEAS_TOL, CROSSOVER, MIP_HEURISTIC,
  MIP_DETECT_SYM, MIP_FEAS_TOL, MIP_REL_GAP.