GRAILS-11228 - special command object param handling

The special command object parameter handling is now tied to the controller action argument name, not the command object class name.

class DemoController {

    def buy(Person buyer, Person seller) {
        // buyer will be populated with the values of params
        // like buyer.name, buyer.address.city and buyer.address.state

        // seller will be populated with the values of params
        // like seller.name, seller.address.city and seller.address.state
    }
}

class Person {
    String name
    Address address
}

class Address {
    String city
    String state
}
restore some previously ignored tests
GRAILS-9686 - fix problem where errors property was being constrained