Perfect foresight: allow stack_solve_algo={2,3} without block nor bytecode

doc/manual/source/the-model-file.rst

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

.../perfect-foresight-models/private/check_input_arguments.m

matlab/perfect-foresight-models/sim1.m

tests/run_block_bytecode_tests.m