Major re-organization of handlers. PLEASE NOTE: This drastically affected the Views module API and until modules are updated to match, they will stop working. Efforts have been made to ensure that this won't cause your site to crash, but that's partly up to the individual module as well.

Exposed filters needed to use $form_state[input] not $form[#post], which was causing the "remember" setting to fail intermittently; also, if filters are not overridden use the default display ID for session storage so that remembered filters can be shared across displays.