#307287: (Panels related) view::preview() would override previously set arguments if no arguments were sent.

Since it's not easily possible to do the views filter block externally, bring the functionality directly into Views, including modifying the ajax for that to work.

Reworked access control to be a plugin. This will have the beneficial effect of drastically reducing Views load during menu access checks.

#279899 by mooffie and nonsie: Move views_preprocess_node() to views.module so it always appears; add display name to node template suggestions. Needs documentation.

#282755 by mooffie, pwolanin, mroswell, heather, ff1, others: Improved example text for getting started page, separated into new files.

#289425: Exports losing some information on overridden fields if the overridden field happens to equal the original default value of the field.

Automatically allow IS NULL and IS NOT NULL filters on all filters that support this if relationships are present.

#279257: Check for handlers and plugins when importing a view to make sure everything is available and prevent crashy crashy.

Exposed filter memory was being trashed by a rewriting validate; also, exposed filters that decided not to participate weren't properly storing that status in session. This fixes both things.

Revamped export functionality. This is a less verbose export that takes advantage of the newer options/defaults system so that it does not have to export quite as much data. Also a tool to export multiple views simultaneously.

Modify $view to only use handlers for the field items, since it cares a lot more about the handlers than it cares about the actual storage of the field items. This could have implications for modules, particularly date and calendar.