Code review comment for lp:~leonardr/launchpad/no-mutator-named-operations

This is a little different from other version-specific changes because it's one change that affects _every_ mutator named operation, not a bunch of decisions made on a case-by-case basis. So I think it's sufficient to show that, in general, named operations are available in beta but not in 1.0, which is what the transitionToImportance test does.

In general, the plan is to pick a few applications written against beta, and make sure they continue to work against beta as we change 1.0, rather than write a test for every change. But even by the standards of "write a test for every change", I think in this case a single representative test is good enough.