use std::stoi or std::stoul instead of atoi (bug #65342) The std::stoi and std::stoul functions allow us to distinguish between invalid values and out of range values instead of just returning 0 for any conversion failure as atoi does. In the following changes, we now attempt to provide better diagnostics where possible. * pathsearch.cc (directory_path::init): Use std::stoul instead of atoi. Issue warnings for out of range or invalid values. * __init_fltk__.cc (fltk_uimenu::add_entry): Use std::stoi instead of atoi. * event-manager.cc (F__event_manager_file_dialog__): Use std::stoi instead of atoi. * bp-table.cc (bp_table::parse_dbfunction_params): Use std::stoi instead of atoi. * data-conv.cc (oct_data_conv::string_to_data_type): Use std::stoi instead of atoi. * debug.cc (parse_start_end, parse_integer_argument): New static functions. (Fdbtype): Use parse_start_end to improve parsing of integer arguments. (Fdblist, Fdbstack, do_dbupdown): Use parse_integer_argument to improve handling of integer argument values.