Verify the integrity of the current repository.
This will perform an extensive check of the repository's integrity, validating the hashes and checksums
of each entry in the changelog, manifest, and tracked files, as well as the integrity of their crosslinks
and indices.
Please see https://mercurial-scm.org/wiki/RepositoryCorruption for more information about recovery from
corruption of the repository.
For an alternative UI with a lot more control over the verification process and better error reporting,
try hghelpadmin::verify.
Returns 0 on success, 1 if errors are encountered.