override previous merge with mpm.
merge at
ef8ee4477019 was bad.
redo merge with mpm.
previous merge at
ef8ee4477019 was bad.
Unify mq and hg patch invocation.
This makes patch a little less verbose by default, so the tests
had to be updated.
tests: new test for mq qdiff command
`hg qdiff .' is supposed to work but it is currently broken.
This test should help us verify when it gets fixed.