Ensure that all perfect foresight solvers work with periods=1.

...rfect-foresight-models/linear_perfect_foresight_problem.m

.../perfect-foresight-models/perfect_foresight_mcp_problem.m

matlab/perfect-foresight-models/perfect_foresight_problem.m

matlab/perfect-foresight-models/perfect_foresight_solver.m

.../perfect-foresight-models/perfect_foresight_solver_core.m

...ect-foresight-models/private/initialize_stacked_problem.m

matlab/perfect-foresight-models/private/simulation_core.m

matlab/perfect-foresight-models/sim1.m

matlab/perfect-foresight-models/sim1_linear.m

...b/perfect-foresight-models/solve_stacked_linear_problem.m

matlab/perfect-foresight-models/solve_stacked_problem.m