revlog: fix misleading comment about _maxinline

verify: print short `p1` node in relevant dirstate messages This will help with debugging.

verify: also check dirstate The dirstate already is capable of verifying its integrity (although v2 features are not yet checked), let's run that code in `hg verify`.

tests: use the `--quiet` flag for verify when applicable This reduces a lot of the test output that was otherwise useless, and also makes it a lot easier to add things to verify without breaking the test suite because of additional output.

verify: format messages directly at the source

dirstate: update messages in verify to not use the old `state` API

dirstate: add narrow support to `verify` This will be called later in the series by the `verify` command.

dirstate: stop using `entry.state()` for logic in `verify` Use the new API instead of the deprecated one. The next changeset will remove the use of `state` in this method altogether (currently still in the messages)

dirstate-entry: add `modified` property This was already done in the Rust implementation and is a useful primitive. The C implementation had this called `merged`, but wasn't used anywhere. It will be used in the next changeset.

debug: add debug-revlog-stats command Display statistics about revlogs in the store. Useful to get an approximate size of a repository, etc. More statistics will be added in the future.