backporting changes to exported results for collaborative editing

[Samuel Wales <samologist@gmail.com>]

suppose you export a subtree to ascii or html, and then a bunch of
people want to help you edit it.  obviously you want the changes back
in org.

obviously the best would be if you could give them the source,
complete with comments.  but assume that they are not computer people,
and not org people, and you don't want to give them your irrelevant
comments.

also assume you also don't want to give them your irrelevant tasks and
you do not use org-export-with-tasks.

it might be that i already know the answer: just do the best you can
with diff, and request small sets of changes at a time, or request
manual instructions for changes.  but perhaps you have ideas?

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