Trace upwards through call tree for config_flags

  1. config_flags is dummy arg 2 of med_sidata_input (main/real_em.f);
     corresponding actual arg is config_flags, arg number 1 in call 1 by med_sidata_input (main/real_em.f).

config_flags is not an argument to real_data. May be local or use-associated.
real_data has 0 arguments

config_flags is an actual arg in calls to these routines from med_sidata_input
  open_r_dataset (argument 4 ; matching dummy arg is config_flags with intent in)
  input_aux_model_input1 (argument 3 ; matching dummy arg is config_flags with intent in)
  init_module_optional_si_input (argument 2 ; matching dummy arg is config_flags with intent inout)
  model_to_grid_config_rec (argument 3 ; matching dummy arg is grid_config_rec with intent out)
  close_dataset (argument 2 ; matching dummy arg is config_flags with intent in)
  assemble_output (argument 2 ; matching dummy arg is config_flags with intent inout)