[Nitro] FormHelper::FormXmlBuilder#attribute without label

[Malte Milatz]

George Moschovitis:
> how about f.input .... ?

Hm, alright, then I do not need the helper at all. Thanks, next
question:

f.attribute appends "_ctl" to the id. Should I imitate this, or does it
not matter? By the way, this seems to be a bug in FormHelper: The for
attribute of <label> and the id attribute of <input> do not match.

Malte