Change field name

[Florian Bogeschdorfer]

> 
> Hi Florian,
> 
> I am sure you ask about V4MD.

Yes, sorry for not mentioning it

> 
> YES. Just few days ago other developer also have found that 
> API V4MD Do not have this function.
> 
> I can add it easy.
> 

In this special case I was able to use "RemoveField" and "AddField" but for
the future it would be necessary.
Of course why would it be necessary to rename a field? That is if you are as
stupid as me and create a DB with my__Field instead of my_Field and have
already distributed it...

Best regards, Florian