perf: remove fallbacks to ancient versions of dirstate.walk() If the call to dirstate.walk() failed, we would try to fall back to older versions. These were removed in d3d1d39da2fa (walk: remove cmdutil.walk, 2008-05-12) and f8299c84b5b6 (dirstate: fold statwalk and walk, 2008-06-26). We don't care about testing performance of versions that old versions at this point, so let's clean up. Differential Revision: https://phab.mercurial-scm.org/D845

releasenotes: update docstrings with information on additional flags This patch adds documentation related to the two new flags --check and --list for releasenotes extension. Differential Revision: https://phab.mercurial-scm.org/D544

releasenotes: raise error on simultaneous usage of flags The releasenotes command is supposed to raise an error when --list and --rev/--check flags are used together. This patch adds the above functionality. Differential Revision: https://phab.mercurial-scm.org/D831

dirstate: move parents source of truth to dirstatemap As part of moving dirstate storage to its own class, let's move the source of truth for the dirstate parents to dirstatemap. This requires that dirstate._pl no longer be a cache, and that all sets go through dirstatemap.setparents. Differential Revision: https://phab.mercurial-scm.org/D759

dirstate: move parent reading to the dirstatemap class As part of moving dirstate storage logic to a separate class, let's move the function that reads the parents from the file. This will allow extensions to write dirstate's that store the parents in other ways. Differential Revision: https://phab.mercurial-scm.org/D758

dirstate: move opendirstatefile to dirstatemap As part of moving the dirstate storage logic to another class, let's move opendirstatefile to dirstatemap. This will allow extensions to replace the pending abstraction. Future patches will move the consumers of _opendirstatefile into dirstatemap as well. Differential Revision: https://phab.mercurial-scm.org/D757

dirstate: move _copymap to dirstatemap As part of moving all dirstate storage to a new class, let's move the copymap onto that class. In a future patch this will let us move the read/write functions to the dirstatemap class, and for extensions this lets us replace the copy storage with alternative storage. Differential Revision: https://phab.mercurial-scm.org/D756