util: add optional path auditor argument to canonpath
The canonpath function will default to creating its own path auditor,
but in some cases it will be useful to use a specialized auditor,
e.g., one that wont abort if a path lies within a subrepository.
abort: repository a not found!
255
abort: error: Connection refused
255
abort: repository a not found!
255
abort: Permission denied: ../a
255
abort: repository a not found!
255
destination directory: q
abort: destination 'q' is not empty
abort: destination 'a' is not empty
255
adding c
255
dir is still here
repo is gone