Fix default clone destination
The default clone wasn't working:
$ hg clone hg
abort: repository hg/.hg not found!
This was because we were creating the destination directory from the
default, then checking whether it existed to determine whether to
expand the path.
merge: warning: conflicts during merge
merging a
merging a failed!
32e80765d7fe+75234512624c+ tip
something else
=======
something
M a