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* [FIX,ENH,REF,DOC] Several fixes to search
* Fix imporperly formatted tracker results in search when MySql indexing is used.
* Put tracker main field at the end of "contents" so it's not displayed close to the title.
* Fix title duplication in "contents"
* Partial refactor of isMain fields in trackerlib.
* Type and document large parts of the indexer.
* Fix bug in UserSource looking for non-existent user tracker 0
* Start throwing exceptions when we try to use nonexistent raw id's in factories, this already surfaced serveral minor bugs, and will certainly surface more

See merge request !4632