#521954 by Agileware: Allow taxonomy breadcrumbs to link to actual taxonomy page instead of back to view.

#496634 by dereine: Fix long-standing issue of "0" not being a valid argument for multiple integer CCK types.

#381346 by ayalon: Allow Taxonomy: Tid as a field, which is now needed for rewrites which may need tids.

Fix taxonomy term ID field, filter and argument for term views, which were incorrectly keying off of term_node.

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.

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.