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.

Allow validators to change from a hard fail state to a soft fail state when validating from the menu. Yes, I realize this makes no sense to anyone but me and aclight.

Create a "soft" fail condition for arguments, which means that if an argument is part of a % placeholder in a URL, failing validation is not actually a failure IF there is some other action to take when validation fails.

#271240 by mschiff: pgsql compatibility, left() doesn't exist but substr() exists in both pgsql and mysql.

Fix argument validator so that access() is handled properly like it is on the default argument type.

#274807: setting the validate fail action to summary was not informing the UI that a style plugin is needed.

#270892 by aclight (expanded by me): put default action and validator options in a fieldset to make the form less confusing.

Fix a problem with relationships that caused the adjust_join to sometimes not be run, thanks to a minor error in the join collapsing code.

Some refactoring of how handlers are handled, particularly with their default options. This is an unfortunately widespread change and will affect modules utilizing the API.

Restore missing functionality from Views 1 to node: nid argument; expand node validator to compensate; also give that functionality to user: uid and node revision: vid

A special argument that will modify the depth of the previous term argument, so we can emulate the original taxonomy/term URL.

#256492: NULL return from argument default plugin caused no argument check instead of validate fail check.

Tutorial for creating a "user list" view in the getting started doc, plus some fixes for bugs the tutorial revealed.

Various fixes, including making sure that exposed filter settings pass through to argument links and pager links.

#249489: Remove extraneous, incorrect #description from "transform spaces to dashes" which is pretty descriptive on its own.

NEW: argument defaults and validation; pluggable. This will greatly ease some of the problems with argument discovery. We need to get a few more basic plugins written for this.