+ 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).