Plone.app.search

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Breaking changes:

- *add item here*

New features:

- *add item here*

Bug fixes:

- *add item here*

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Bug fixes:

- Ignore unknown ``sort_on`` indexes. [maurits]

-------------------

Bug fixes:

- Fixed sometimes failing search order tests. [maurits]

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Bug fixes:

- Fix Search RSS link condition to use search_rss_enabled option and use
rss.png instead of rss.gif that doesn't exist anymore.
[vincentfretin]

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New features:

- Added options to change default search order.
[rodfersou]

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- (backport) 13999 Do not error if Plone 3 advanced search parameters
are used
[anthonygerrard]