woops. didn't want to commit this to DRUPAL-5. this refactor belongs in the upcoming diff 5.2 release which currently comes form HEAD

per node type (since it doesn't always work), and allow users without
'view revisions' permissions to still use the 'Preview changes' button.

rollback node type specific tab visibility. cmenu.inc does not allow that for contextual items. will return for D6

module. Now based on the GPL'ed mediawiki PHP diff engine from phpwiki.
Instead of a separate diff tab, this overrides the revisions tab and
provides radio buttons to select which revisions to view diffs between.
Shows diffs in unfiltered, raw node data, instead of rendered HTML.
Also, provides a hook_diff() for modules to define any parts of a node
that they control with revisions (e.g. file uploads, etc) for display.
[backporting from HEAD into DRUPAL-5 branch]

create branch 'DRUPAL-5'.

Cherrypick from master 2007-01-31 17:45:25 UTC Derek Wright <git@dwwright.net> '#110857 by rotzi (with some changes by dww): complete re-write of the':
    DiffEngine.php
    cck.inc
    diff.install
    node.inc
    taxonomy.inc
    upload.inc

update PEAR to latest. i fixed paths for include files and commented out _encode() method in inline.php because it was encoding all output. hope that doesn't disturb the diffs