occbin_write_regimes: distinguish between smoother and simulations

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

matlab/+occbin/graph.m

matlab/+occbin/set_default_options.m

matlab/+occbin/solver.m

matlab/+occbin/unpack_simulations.m

matlab/+occbin/write_regimes_to_xls.m

preprocessor

tests/occbin/filter/NKM.mod

tests/occbin/model_borrcon/borrcon_0_std_shocks.mod

...ccbin/model_irrcap_twoconstraints/dynrbc_0_std_shocks.mod

tests/occbin/model_irrcap_twoconstraints/dynrbc_common.inc