More attribute bloat tests, pinwheel to monitor progress.

Watching the pinwheel makes it clear that the painfully slow execution
of test_attribute_bloat_flash_many() isn't a single hidously long
delay anywhere, rather it's a long steady stream of slow operations
and it's the cumulative time that's hurting us.  Most likely this is
entirely dominated by flash write time, and suggests that it may be
worth the additional API and implementation complexity to handle
setting a complete set of attributes in a single operation, so that we
only have to pay the flash write toll once.

Will probably require further testing before we can make an informed
decision.

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