Products-feedfeeder

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- Moved to https://github.com/collective/Products.feedfeeder
[maurits]

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- Avoid BadRequest error when an entry has two enclosures with the
same href; we ignore all subsequent ones.
Fixes http://plone.org/products/feedfeeder/issues/41
[maurits]

- Try to avoid possible ExpatError for some feeds.
Fixes http://plone.org/products/feedfeeder/issues/40
[maurits]

- Cleaned up our type info, removing some cruft from Plone 2.5.
Added upgrade step for this.
[maurits]

- protect against UnicodeDecode errors in getting the UID
of an entry.
[vangheem]

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- Guard against links (enclosures) not having a type.
Fixes http://plone.org/products/feedfeeder/issues/39
[maurits]

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- Use feed-item.pt on Plone 4, filling the content-core slot, and
feed-item3.pt on Plone 3, filling the body slot as before.
Fixes http://plone.org/products/feedfeeder/issues/36
[maurits]

- Register our own documentbyline viewlet for feed items, which
displays the feed item author as creator.
Refs http://plone.org/products/feedfeeder/issues/36
[Maurits]

- Fixed possible UnicodeDecodeError when updating feed items.
Refs http://plone.org/products/feedfeeder/issues/37
[maurits]

- Fixed Plone 4.1 compatibility
[iElectric]

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- Avoid DeprecationWarning on python2.6 by preferring hashlib over md5
when available.
[maurits]

- Do not reindex the feed item when nothing has changed. Only update
the objectInfo field when there has been a change.
Fixes http://plone.org/products/feedfeeder/issues/34
[maurits]

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- Respect the Plone setting on the 'about' information: only show the
document byline if the user is logged in or anonymous users are
allowed to view the about information.
[markvl]