Merge branch 'lo/mv-missing-dest-dir-check' into jch

'git mv' has been updated to check for a missing destination leading directory during the checking phase, allowing 'git mv -n' to report the failure. The error message when the rename(2) syscall fails has also been improved to name both the source and the destination. * lo/mv-missing-dest-dir-check: mv: reject a destination whose leading path is missing or a symlink mv: name both source and destination when rename fails