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possibility of overlay leakage by making them volatile.

* allout-widgets.el (allout-widgets-tally): Define as nil so the hash is
not shared between buffers.  Mode initialization is responsible for giving
it a useful starting value.
(allout-item-span): Reduce possibility of overlay leakage by making them
volatile.
(allout-widgets-count-buttons-in-region): Add diagnostic function for
tracking down overlay leaks.