dirstate: push back the future a bit in the test The future was set to 2021-01-01, we push it by 10 years.

dirstate-item: point out that `merged` is set only with p1_tracked This is currently True, and we will use this fact to simplify the API in the next commit. However, we add this assertion first to validate that this is True in the whole test-suite.

dirstate-item: update the attribute documentation It was very outdated. We are about to change these attribute so we should has well have them documented so that the change get easier to grasp.

dirstate-item: use `any_tracked` more This simplify more code.

dirstate-item: drop an outdated comments This comment is no longer relevant since we moved away from the `state` internal representation, multiple weeks ago.

dirstate: remove a update_file's special case for `merged` file This case was fishy and can be dealt with by passing more accurate data a higher level. This clarify the API and prepare for a larger rework of the data we feeds to the dirstate.

dirstate: remove a update_file's special case for tracked file with p2 data This case was fishy and can be dealt with by passing more accurate data a higher level. This clarify the API and prepare for a larger rework of the data we feeds to the dirstate.

dirstate: deprecate `__getitem__` access If we want to drop `state` usage, we need to deprecate this. Differential Revision: https://phab.mercurial-scm.org/D11544

dirstate-item: use item's property instead of `state` in largefile Differential Revision: https://phab.mercurial-scm.org/D11543

dirstate-item: use `added` instead of `state` when moving dirstate Differential Revision: https://phab.mercurial-scm.org/D11542

dirstate-item: use item's property instead of `state` in revert Differential Revision: https://phab.mercurial-scm.org/D11541

dirstate-item: use item's property when computing a copies Differential Revision: https://phab.mercurial-scm.org/D11540

dirstate-item: use item's property instead of `state` in copy Differential Revision: https://phab.mercurial-scm.org/D11539

dirstate-item: use `added` in debugrebuilddirstate (instead of `state`) Differential Revision: https://phab.mercurial-scm.org/D11538

dirstate-item: use `maybe_clean` instead of `state` in record Differential Revision: https://phab.mercurial-scm.org/D11537

dirstate-item: use `any_tracked` instead of `state` to apply patches Differential Revision: https://phab.mercurial-scm.org/D11536

dirstate-item: use item's property instead of `state` in addremove Differential Revision: https://phab.mercurial-scm.org/D11535

dirstate-item: use `tracked` instead of `state` during copy detection Differential Revision: https://phab.mercurial-scm.org/D11534

dirstate-item: use `maybe_clean` instead of `state` in `strip` Differential Revision: https://phab.mercurial-scm.org/D11533

dirstate-item: use `tracked` instead of `state` in context.matches Differential Revision: https://phab.mercurial-scm.org/D11532

dirstate-item: use `tracked` instead of the `state` in context's iter Differential Revision: https://phab.mercurial-scm.org/D11531

dirstate-item: use `tracked` instead of the `state` in context Differential Revision: https://phab.mercurial-scm.org/D11530

dirstate-item: use item's property to deal with hgsubstate in mq This is clearer than processing the `state`. Differential Revision: https://phab.mercurial-scm.org/D11529

dirstate-item: use `added` instead of the `state` in the `mq` extension Differential Revision: https://phab.mercurial-scm.org/D11528

dirstate-item: use maybe_clean instead of `state` in the eol extension Differential Revision: https://phab.mercurial-scm.org/D11527

dirstate: move verification code within the dirstate itself This move implementation details further down the stack and make it the verification code easier to discover. Differential Revision: https://phab.mercurial-scm.org/D11526

dirstate-entry: use `?` for the state of entry without any tracking This is what the dirstate use at a higher level. Differential Revision: https://phab.mercurial-scm.org/D11525

dirstate-item: introduce a `any_tracked` property This property is True is the file is tracked anywhere, either the working copy, or any of the parent. Differential Revision: https://phab.mercurial-scm.org/D11524

dirstate-item: introduce a `maybe_clean` property It is useful for some extension that seek to invalidate some state. Differential Revision: https://phab.mercurial-scm.org/D11523

dirstate: add a `get_entry` method to the dirstate This method give access to the underlying `DirstateEntry` object (or an empty one if None was there). It should allow us to use the more semantic property of the entry instead of the state where we needs it. Differential Revision: https://phab.mercurial-scm.org/D11522

dirstate-item: Make constructor parameters optional … in the C implementation of DirstateItem, like they already were in the Python and Rust ones. Differential Revision: https://phab.mercurial-scm.org/D11521

hg-core: silence dead-code warning by adding RevlogEntry::revion() accessor Nightly `rustc` warns about the `RevlogEntry::rev` field not being used. Rather than removing it, I added an accessor since it seems useful to be able to get the entry's revision. Differential Revision: https://phab.mercurial-scm.org/D11548