In addition to selecting a xar and allowing a user to check to allow the
xar's content to blindly overwrite the previous entry;  add a third option

When "merge" is selected, for that selected document, the diffs between the
uploaded-xar and the current db are presented in a "mergediff-in-browser"
style, allowing selection of  original content from the db versus xar.
clicking "ok" then collapses the diff and remembers the choices taken.

When the user has either selected the xar files they want to import
directly, or used the mergediff tool above to select the contents of the new
file, they click "import" and it's done. Note that the "mergediff" files,
create a new version, unlike the overwrite done by the current selected
checkboxes in the import tool.

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