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.
checking changesets
checking manifests
crosschecking files in changesets and manifests
checking files
1 files, 1 changesets, 1 total revisions
changeset: 0:acb14030fe0a
tag: tip
user: test
date: Thu Jan 1 00:00:00 1970 +0000
summary: test
rolling back last transaction
checking changesets
checking manifests
crosschecking files in changesets and manifests
checking files
0 files, 0 changesets, 0 total revisions
A a