Switch cat command to use walk code.
The old syntax of "hg cat FILE REV" is now obsolete.
Use "hg cat -r REV FILE" instead, as for all other commands.
Is there an error message when trying to diff non-existing files?
found: No such file or directory
not: No such file or directory
Is there an error message when trying to add non-existing files?
found: No such file or directory
not: No such file or directory