correct the relative path when walking from a subdir - yield the correct relative path when walking from a subdir (regardless the walk is repo-wide or not) - have a consistent output from all commands: filename are absolute when no patterns are specified and relative otherwise.

adding a
adding b
a
NONEXISTENT: No such file or directory
a
b
a: No such file or directory
NONEXISTENT: No such file or directory
b
a
NONEXISTENT: No such file in rev 9e1684505872
a
b