SearchIndex: rector, phpcs, type hint fixes

SearchIndex: review fixes — auto-save MemoryIndex, cast TupleOps counts, style cleanups

- MemoryIndex: auto-save dirty data on unlock/destruction to prevent
silent index corruption when indexes ar

SearchIndex: review fixes — auto-save MemoryIndex, cast TupleOps counts, style cleanups

- MemoryIndex: auto-save dirty data on unlock/destruction to prevent
silent index corruption when indexes are used in tandem
- TupleOps::parseTuples(): cast exploded count strings to int
- FileIndex::retrieveRow(): document the write-on-read padding behavior
- Fix whitespace issues in ApiCore, common.php, Sitemap/Mapper
- Update concept.txt to reflect MemoryIndex auto-save behavior

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SearchIndex: TupleOps now work with frequencies of 1

We have indexes where we simply track that a relation between entity and
token exists, but there is no frequency. The frequency is always 1.
For

SearchIndex: TupleOps now work with frequencies of 1

We have indexes where we simply track that a relation between entity and
token exists, but there is no frequency. The frequency is always 1.
For those indexes we do not store *1 as frequency but omit it
completely.

The TupleOps class now can work with such indexes and will also store
frequencies of 1 like this.

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Working fulltext collection and search

This finalizes the FulltextCollection and FulltextCollectionSearch
classes. Proper locking is implemented, tests have been enhanced.

It should be possible to

Working fulltext collection and search

This finalizes the FulltextCollection and FulltextCollectionSearch
classes. Proper locking is implemented, tests have been enhanced.

It should be possible to reimplement the page full text search on top of
it.

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Changed IndexAccessor names based on access method not content