Disable form validation more thoroughly

Disable form validation more thoroughly

Expands on r67283 by not using any HTML5 input types either, except
search.  Otherwise you'd still have problems when changing integer
fields in Special:Preferences, say.  Sad, since in Opera it had a cute
little widget for incrementing/decrementing, and types like email have
some neat effects on platforms like the iPhone (see
<http://diveintohtml5.org/forms.html#type-email>).  But there's no other
way to disable the constraints these impose without using JS, and given
how broken WebKit is right now . . .