tests/test-diff-newlines

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.

#!/bin/sh

hg init
python -c 'print "confuse str.splitlines\nembedded\rnewline"' > a
hg ci -Ama -d '1 0'
echo clean diff >> a
hg ci -mb -d '2 0'
hg diff -r0 -r1