Adds an input box to the edit/ page, where users can put a summary
of the cahnges they made. This ChangeLog+ can later be displayed on
the RecentChanges+ page. ("UpdatedPages" currently does not use
this however.)
While this additional field is a bit more time consuming, users
often fill it out, to advocate the changes they've contributed to
particular pages.
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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.