Ability to use HelpText.AutoBuild() without parser results

[zii-dmg]

Using commit e00dd9f.

Sometimes Parser.ParseArguments throws exceptions (for example, InvalidOperationException: "Sequence contains more than one matching element") and ParseResult doesn't created, but I still need to show help usage to user. Without ParserResult I can't do this easily.

Or maybe I doesn't understand how to use help usage auto generation on exceptions.

[mystcreater]

Today, I had this exception because I tried to use an options class which inherit from another options class. Seems the library doesn't support inheritance.

[gsscoder]

As you can see, @mystcreater, FSharp façade API as been moved to specific branch (this was not the case when @zii-dmg posted).

Since the work on pre-release 2.0 has been halted for a while (but as you can see from GitHub activity I'm really back to work hard on the project), as now I prefer to invest time in stabilizing library C# kernel.

I've added a very simple F# example as fsharp script.

Once 2.0 stabilizes (or if some developer want to help) and there's interest in: I'll be very glad to continue development of an F# surface API (CommandLine.FSharp.dll).

For the moment I suggest to use directly CommandLine.dll directly (since issues are closed every day, I suggest you compile from sources -- when a 2.0.x-pre is released in NuGet, I'll ping it via Twitter).

I'm too currently using 2.0.x-pre from F# for a little project I plan to open in next weeks, so if possible, I ask you to post the these types (so discussion can continue).

Please note that 2.0 is still pre-release quality software: also if very latest source are (as said) each day more stable...