Other WikiWares+ markup

The WikiWorld+ still lacks a unified markup (and thus also the
interchangeablity that made html THE standard it is today), and
while ewiki usues nearly MeatBall:WikiMarkupStandard, you may want
to reuse existing pages from another Wiki.

Currently we provide emulation for:
* PhpWiki+
* sfWiki
* miki
* bbcode (BulletinBoard+, not a Wiki)

But please see the individual files on which (additional) markup
they introduce.

These plugins on occasion only register their markup within
$ewiki_config["wm_*"] settings, but often just perform
pre-conversion of foreign markup by utilizing the ["format_src"]
plugin hook (they then pre-convert page content to use ewiki
markup rules before the ewiki_format() kernel performs
prev << "markup plugins"
next >> "markup/css"

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.