This function creates hard links if possible, falling back to copying
the file if the destination is on a different volume to the source.
The docstring for copyhardlinktree() is also updated to make the
difference between the two functions a little clearer.
Signed-off-by: Paul Barker <paul@betafive.co.uk> Signed-off-by: Ross Burton <ross.burton@intel.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
