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Here's a revised patch. The previous version actually was
too lenient: it could list submodules as "maybe missing"
when they were missing for sure. Fixed by tracking
unresolvable starimports.

(Removed the module.badimports attribute of my previous
patch, it now uses mf.badimports appropriately.)

Meta question: are we going to commit fixes to
modulefinder.py in the freeze directory and do the move when
the doco is done, or do we not commit anything until we're
ready for the move?