dirstate: remove the python-side whitelist of allowed matchers This whitelist is too permissive because it allows matchers that contain disallowed ones deep inside, for example through `intersectionmatcher`. It is also too restrictive because it doesn't pass through some of the matchers we support, such as `patternmatcher`. It's also unnecessary because unsupported matchers raise `FallbackError` and we fall back anyway. Making this change makes more of the tests use rust code path, and therefore subtly change behavior. For example, rust status in largefiles repos seems to have strange behavior.

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Issue351: mq: qrefresh can create extra revlog entry

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  $ echo "[extensions]" >> $HGRCPATH

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  $ echo "mq=" >> $HGRCPATH

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  $ hg init repo

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  $ cd repo

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  $ hg qinit

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  $ echo b > b

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  $ hg ci -A -m foo

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  adding b

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  $ echo cc > b

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  $ hg qnew -f foo.diff

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  $ echo b > b

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  $ hg qrefresh

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  $ hg debugindex b

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     rev linkrev       nodeid    p1-nodeid    p2-nodeid

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       0       0 1e88685f5dde 000000000000 000000000000

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