Hide implementation methods

[ovatsus]

Csv

Method CsvFile.Parse: data:TextReader * sep:string option -> CsvFile is accessible, but it really shouldn't, because it returns CsvFile, and not the generated CsvType.
On other type providers, this problem doesn't exist because we usually replace the methods with others with the same signature in the derived generated class, but in the CsvProvider case, the generated Parse method doesn't have the sep parameter.
The ideal would be to make this method protected, but F# doesn't support that. Any other ideas to fix this?

WorldBank

There's a bunch of _Get methods that get the untyped data. We can hide them by putting them in an interface. Maybe that can also fix the problem with csv

[ovatsus]

By replacing the CsvFile.Parse with a constructor this can be solved, as the constructors of the real type will always be hidden. I'll submit a fix for this soon

[tpetricek]

Sounds good to me, in fact, I do not know why the type used static method rather than constructor....