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+ or -.==========
Allowed inclusion of supplementary data, with recovery (closes #3).
Added a warning to recover_data when data object exists in the calling frame
but has changed since being captured, with opt-out where used interactively
(closes #4). Note that this is responsible for the less than 100% code coverage
(everything except if (interactive()) is covered.
Moved README supplementary objects out of package, reducing package filesize (closes #2).
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