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This is mainly a feature release, but also contains a number of minor bugfixes and refactoring of the core "related" search algorithm. Key issues are:
* #367969: Filtering results by content type
* #191811: Re-rolled an old patch to localize the list of stopwords based on the current language (also added french and german stopwords lists)
* #958530: Add basic i18n support to related content algorithm
* split hook_block into multiple hooks
* overhaul core routine to search for "related" nodes
* various coding standards/review updates
* Doxygen comments updated
Basic testing confirms the module is functioning as advertised. The core search routine was modified significantly to match D7 APIs, but appears to function as before.