eliminate WHO arguments from interpreter-private functions * interpreter-private.h, inpterpreter-private.cc (__get_interpreter__, __get_dynamic_loader__, __get_error_system__, __get_gh_manager__, __get_help_system__, __get_input_system__, __get_load_path__, __get_load_save_system__, __get_event_manager__, __get_output_system__, __get_type_info__, __get_symbol_table__, __get_current_scope__, __require_current_scope__, __get_evaluator__, __get_bp_table__, __get_child_list__, __get_cdef_manager__, __get_display_info__, __get_gtk_manager__): Eliminate WHO argument. Previously, it was never displayed by __get_interpreter__. And, as pointed out by Petter Tomner in patch #10216, passing a std::string object could have performance issues. (__get_interpreter__): Eliminate useless call to error. Display message to std::cerr then abort.

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