netteForms.js: fixed working with RadioNodeList
Forms: validateMaxPostSize do not check whether for is attached [Closes #1288]
Forms: fireEvents() always revalidates form

Fix for too early called isValid()
Revert "Cache: file dependency compares filemtime() with time when cache was created, instead of file's last modified time" [Closes #1242]

This reverts commit 04a4068d5db2f919813d0c9474777eb7abfbf971.