Adds the /italic/, *bold* and _underlined_ markup codes, which
sometimes can heavily garbage pages (because ewiki provides no
general markup escape sequence, but the per-default disabled
<verbatim>, or respectively <nowiki>).
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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.