Don't always show the 'lose your changes' prompt when clicking 'view profile' from the profile page.

It's now only shown if you actually change a field, however:

* The change logic is simple - it's an 'onchange' on the fields themselves, so do not take into account if you make a change and revert it
* It doesn't work for the WYSIWYG boxes, they don't seem to fire onchanges. Would need another way to deal with this