Scrutinizer issues and IXR library updates

Conflicts:
	inc/media.php
	inc/plugin.php
	inc/template.php
	lib/plugins/authplain/_test/escaping.test.php
	lib/plugins/syntax.php

Translation update (fa)

Simplifies modifying the cache via an action plugin

Thanks to Kacper Szurek for reporting this

Provide node/leaf state data in instructions

- includes, xhtml renderer adding 'node' class to <li> when it contains
  child list(s)

Translation update (fa)

Translation update (fr)

Translation update (no)

Translation update (cs)

Trim unnecessary / at start of windowssharelink

Fixed a bug that $conf['compression'] is turned off when gzopen doesn't exist and gzopen64 does exist.

Move check after libraries are loaded, so that $conf['compression'] is not turned off in the case that gzopen doesn't exist while gzopen64 does exist, as inc/compatibility.php ought to have fixed.

Accept some new gTLD e-Mail addresses

Translation update (zh-tw)

Translation update (de)

Translation update (cs)

visibility from private to protected for DokuCssFile