#012345: ezcInputForm->isValid()

It would be handy to have a fast method to check, if all elements are valid. The same information can be taken by if( empty( $form->getInvalidProperties() ) ), but runs an unnecessary foreach.

The implementation is trivial. In parseInput():
$this->isValid = true;

and in lines 221 and 236:
$this->properties[$elementName] = ezcInputForm::INVALID;
$this->isValid = false;

public function isValid() { return $this->isValid; }

Operating System:
PHP Version: (please be specific, like '4.4.3' or '5.1.5')
Database and version:
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