Products.pluginregistry

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- Moved documentation out of the product directory.

- Fixed plugin management links on the Active screen.

- Fixed deprecation warnings for use of Globals.

- Purged old Zope2 interfaces for Zope 2.12 compatibility.

- Updated GenericSetup import to initialize plugin registry's ``_plugins``
attribute if necessary.

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- Fixed bad behaviour when moving the top plugin up.
https://bugs.launchpad.net/bugs/164717

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- Updated ``PluginRegistry.listPlugins`` to drop previously-activated
plugins when they no longer implement the plugin interface.
https://bugs.launchpad.net/zope-pas/+bug/161281

- Updated ``exportimport`` to skip adding duplicate interfaces during
non-purge imports.
https://bugs.launchpad.net/zope-pas/+bug/161280

- Fixed test breakage on Zope 2.10.

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- Added workaround for autogen factories which assume they can
pass an ID to the registry's ``__init__``. In particular, this
allows the registry to be created and popluated as a "normal"
content object using GenericSetup.

- Improved BBB for testing under Zope 2.8.

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- Moved interfaces into a top-level module (no need for a package),
and made them forward-compatible with Z3 interfaces.

- Wired in DAV / FTP / ExternalEditor support for the registry,
along with a ZMI form for updating it as XML.

- Added support for exporting / importing the registry via GenericSetup.

- Moved from CVS to subversion (2005-10-14).

- Removed deprecation warings under Zope 2.8.x.

- Repaired warings appearing in Zope 2.8.5 due to a couple typos
in security declarations.

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- Simplified package directory computation using ``package_home``.

- Added ``test_suite`` to registry tests to improve testability under
``zopectl test``.