verify: report first bad changeset - add linkrev and file arguments to err - track lowest reported linkrev in err - find linkrev in a couple cases - sort linkrevs when reporting a bunch of errors against a file - tidy up lots of messages - make more robust against damaged indexes - report first bad changeset if an error is encountered

     1

% files

     2

dangling -> nothing

     3

% tar

     4

dangling -> nothing

     5

% zip

     6

dangling -> nothing