rust: update the README with more up-to-date and thorough information Differential Revision: https://phab.mercurial-scm.org/D8274

transactions: convert changes['phases'] to list of ranges Consecutive revisions are often in the same phase, especially public revisions. This means that a dictionary keyed by the revision for the phase transitions is highly redundant. Build a list of (range, (old, new)) entries instead and aggressively merge ranges with the same transition. For the test case in issue5691, this reduces memory use by ~20MB. Differential Revision: https://phab.mercurial-scm.org/D8125

test-install: don't print Rust re2 bindings information if Rust is not in use Differential Revision: https://phab.mercurial-scm.org/D8273

tests: drop an extraneous (glob) from test-debugbackupbundle.t Since this was not needed, it ends up causing the test to end with an error saying that the output changed, but with no diff and a message at the end saying "no result code from test". Differential Revision: https://phab.mercurial-scm.org/D8269

pull: add `--confirm` flag to confirm before writing changes This introduces a new flag to pull command `--confirm` and also a config option named `pull.confirm` which if used will prompt user describing changes which are pulled and asking whether to accept them or not. Differential Revision: https://phab.mercurial-scm.org/D8200

scmutil: add option to register summary callbacks as transaction validators We have a list of summary callbacks which are run after the transaction is closed to show what has changed and what not. This patch makes it possible to register those callbacks as transaction validators so that we can show summary before committing the transaction and prompt user to accept the changes. The goal of this is to implement `pull --confirm`. Differential Revision: https://phab.mercurial-scm.org/D8199

transaction: add functionality to have multiple validators This will help us in adding more validators which can aggregate data from transaction and prompt user whether to commit the transaction or not. The current target is to use this to implement `pull --confirm`. Differential Revision: https://phab.mercurial-scm.org/D8198

hgit: make sure repository is local before checking for store type httppeer (and maybe others too) does not have a store attribute. This was causing `hg pull` being broken on a hg repository when the extension is enabled. localpeer.local() does returns a non-None value but I am not sure if it matters. Differential Revision: https://phab.mercurial-scm.org/D8217