test-init: replace 'echo -n' with 'printf'
The '-n' argument to echo is a non-standard extension that isn't
supported on Mac OS X 10.6.
#!/bin/sh
hg init
echo a > a
hg ci -Am t
hg mv a b
hg ci -Am t1
hg debugrename b
hg mv b a
hg ci -Am t2
hg debugrename a
echo % test with --rev
hg debugrename --rev 1 b