Enables to view the differences between two saved page versions
(what changes somebody has done to the page), but it is rather
stupid and guessworking in how it does so.

On a Unix system you might want to use gnu_diff instead.
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You cannot modify the README.plugins file, but anyhow any ideas or suggestion should as usually get filed on BugReports, UserSuggestions or even better the README.plugins.Discussion.