tests/test-verify.out

diff: add --stat for diffstat output

diff/qdiff --stat invokes patch.diffstat() on the diff output.

When in interactive mode, the output's maximum width is determined by the
terminal's width.

% prepare repo
adding FOO.txt
adding QUICK.txt
adding bar.txt

% verify
checking changesets
checking manifests
crosschecking files in changesets and manifests
checking files
3 files, 1 changesets, 3 total revisions

% introduce some bugs in repo

% verify
checking changesets
checking manifests
crosschecking files in changesets and manifests
checking files
 data/FOO.txt.i@0: missing revlog!
 0: empty or missing FOO.txt
 FOO.txt@0: f62022d3d590 in manifests not found
 data/QUICK.txt.i@0: missing revlog!
 0: empty or missing QUICK.txt
 QUICK.txt@0: 88b857db8eba in manifests not found
 data/bar.txt.i@0: missing revlog!
 0: empty or missing bar.txt
 bar.txt@0: 256559129457 in manifests not found
3 files, 1 changesets, 0 total revisions
9 integrity errors encountered!
(first damaged changeset appears to be 0)
% test revlog corruption

% verify
checking changesets
checking manifests
crosschecking files in changesets and manifests
checking files
 a@0: broken revlog! (index data/a.i is corrupted)
warning: orphan revlog 'data/a.i'
1 files, 1 changesets, 0 total revisions
1 warnings encountered!
1 integrity errors encountered!
(first damaged changeset appears to be 0)