rent 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 `hg help admin::verify`.

Returns 0 on success, 1 if errors are encountered.
N