Consider the existence of operands to build on automatic help setup

[ibraimgm]

On cmd.go the setupHelp() function has the following logic to determine if the help flags (-h and --help) should be automatically added:

if (len(cmd.optentries) > 0 || len(cmd.commands) > 0) && cmd.shortopt["-h"] == nil {
  cmd.Bool("help", "h", false, "Show this help message.")
}

Note that it checks for the existence of any flags (len(cmd.optentries) > 0) or commands (len(cmd.commands) > 0). However, it does not account for the existence of operands (cmd.operands), so when a command has no flags or commands, but has operands, the automatic help flag is not generated.

Note that this change might cause impact on some tests.