new features: fieldSet, styleName and enabled

[David Durham]

I've committed changes to svn that add support for field sets,
styleName and enabled attributes.

StyleName and enabled are pretty well self explanatory.

fieldSet needs a small amount of explanation. The way they work is
that by default fields are not part of a fieldSet so,

@Form(..)
MyForm {

@CharField(..)
String name

}

will not result in a fieldSet. The following form has 2 field sets:

@Form(..)
MyForm {

@CharField(.., fieldSet="Personal Info")
String name

@PhoneField(..)
String phone

@TextAreaField(..., fieldSet="Additional Info")
String comments

@TextAreaField(...)
String finalThoughts

}

name and phone would be in the first field set, Personal Info, and
comments and final thoughts would be in the 2nd field set, Additional
Info. So, once you declare a fieldSet, you don't need to say for each
subsequent field that it will be part of the last field set. It just
is, unless you declare a fieldSet with a different heading. Hope that
makes sense. There's an example added to the demo app.

-Dave