Issue when turning off AutoHelp or AutoVersion

**Symptom**

When turning off AutoVersion (or AutoHelp) in the `ParserSettings`, the HelpText still announces these commands as being available.

**Root cause**

In the `Parser` Class, the method `MakeParserResult` is called, which may call `DisplayHelp`.

`DisplayHelp` calls `HelpText.AutoBuild`, which creates a HelpText instance with `AutoVersion` and `AutoHelp` always set to `true` no matter which value has been set in the `ParserSettings` instance.

**How to reproduce**

```
public static class Program {

[Verb("do")]
public class Options {
[Option("what")]
public string What { get; set; }
}

static void Main(string args[]){
Parser p = new Parser(s => { s.AutoVersion = false });
ParserResult r = p.Parse(args, typeof(Options));

}
}
```

Calling the project without any options results in a helptext that includes the 'version' command, which is officially turned of.

If the user then calls the application with the version verb, an error is produced, since the version verb is not known.