tests/test-empty-dir.t

config: use the same hgrc for a cloned repo as for an uninitted repo

This just copies the same local sample hgrc, except it sets the
default path to the repo it was cloned from.

This is cut-and-paste from the local sample hgrc, but I think it's
acceptable, since the two pieces of code are right next to each other
and they're small. There is danger of them going out of synch, but it
would complicate the code too much to get rid of this C&P.

I also add ui as an import to hg.py, but with demandimport, this
should not be a noticeable performance hit.

  $ hg init

  $ echo 123 > a
  $ hg add a
  $ hg commit -m "first" a

  $ mkdir sub
  $ echo 321 > sub/b
  $ hg add sub/b
  $ hg commit -m "second" sub/b

  $ cat sub/b
  321

  $ hg co 0
  0 files updated, 0 files merged, 1 files removed, 0 files unresolved

  $ cat sub/b 2>/dev/null || echo "sub/b not present"
  sub/b not present

  $ test -d sub || echo "sub not present"
  sub not present