Patch: HistoricalRevisions, atct_history support for annotation storage (used by newer ATCT)

New versions of ATContentTypes use Archetypes' annotation storage
(Storage/annotation.py, annotations.py) for some fields.  Annotation
storage was not supported by Zope's built in history feature, making it
impossible to use a number of cool features that used to be standard, like
the "history" tab mixin for ATCT, and Plone's history_form (still
included, but broken, in 2.1.2).

For more information on this issue, see the following threads:
http://thread.gmane.org/gmane.comp.web.zope.plone.archetypes.general/2480
http://thread.gmane.org/gmane.comp.web.zope.zodb/6299

We implemented a patch to add zope history support for content types using
annotation storage. It also supports the copying of an old revision to a
new revision. The patch has been tested with Plone 2.1.2, Archetypes
1.0.3, and Zope 2.8.5. It should also work with other versions of Plone
and Zope. The patch itself is against the current trunk svn version of
History.py (Revision 40300), but it should patch other versions without
trouble.

This is technically a patch to Zope (not Plone or ATCT), but since it
directly relates to Archetypes/ATContentTypes I figured it would be best
to post here.  If there is some way this could be added to the AT code
instead of Zope code, that might be preferable -- but at this point it
seems like the best file to patch is zope's OFS/History.

The patch/ticket is available here:
https://dev.plone.org/archetypes/ticket/648

Thanks in advance for any feedback/comments...

Matt Hahnfeld
[email protected]



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