record: use uisetup instead of extsetup to register qrecord New commands should be registered in uisetup so that other extensions have a change of wrapping them in extsetup.

merge: supply base node to merge tools in the environment Merge tools will be able to exploit this to correctly merge backouts. This won't work fully, though, until issue 1327 is solved, since the node information is not necessarily correct.

test-bisect: normalize shell error message Different shells on vary in their error messages. Here we're satisfied if the shell mentions './foobar' at all.