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 * include upstream change
 * added dropdowns

This should make it possible to see if mod_security is involved,
at least on servers running mod_php.

Change indentation to ensure code confirms to CodeSniffer rules.

This moves the old plugin manager down to the "other" plugins. It should
probably be removed when when we decide the new one is good to go.

Fixed some issues which occur whenever RTL and LTR languages could
potentially be mixed, using the HTML5 `<bdi>` element.
This element is currently only supported by Chrome and Firefox.

The old and only partially working fix for tpl_breadcrumbs() was removed in
favour of this solution.

and no automatic sitemap.xml is being generated.

In response to FS#2766
- make namespace links in the browser sitemap nofollow
- remove nofollow from browser sitemap link on the wiki start page
  when sitemap.xml generation is disabled

thanks @Klap-in