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.

%!test <*45972>
%! ascii_filename = tempname ();
%! binary_filename = tempname ();
%! f = @ (x, y, varargin) x + y + varargin{1};
%! unwind_protect
%!   save ("-text", ascii_filename, "f");
%!   save ("-binary", binary_filename, "f");
%!   ascii = load (ascii_filename);
%!   binary = load (binary_filename);
%!   assert (f (1, 2, 3), ascii.f (1, 2, 3));
%!   assert (f (1, 2, 3), binary.f (1, 2, 3));
%! unwind_protect_cleanup
%!   unlink (ascii_filename);
%!   unlink (binary_filename);
%! end_unwind_protect

%!testif HAVE_HDF5 <*45972>
%! hdf5_filename = tempname ();
%! f = @ (x, y, varargin) x + y + varargin{1};
%! unwind_protect
%!   save ("-hdf5", hdf5_filename, "f");
%!   hdf5 = load (hdf5_filename);
%!   assert (f (1, 2, 3), hdf5.f (1, 2, 3));
%! unwind_protect_cleanup
%!   unlink (hdf5_filename);
%! end_unwind_protect