tests/test-backwards-remove.out

Cleanups for repo.pull

Use repo.pull in pull and clone commands
Teach clone about ssh:// (temporarily)
Fix up shutil issue on failed pull

+ hg init
+ echo This is file a1
+ hg add a
+ hg commit -t 'commit #0' -d '0 0' -u user
+ ls
a
+ echo This is file b1
+ hg add b
+ hg commit -t 'commit #1' -d '0 0' -u user
+ hg co 0
+ ls
a