Fix inaccurate integration documentation for MedaiWiki

[thatbrock]

Following the integration instructions to-the-letter generates problems on both windows and linux installations. In particular, as with ticket 1057, problems arise with the includes/SpecialPreferences.php hack which can lead to undeclared static property errors.

There are also problems with case sensitivity in the instructions. For example, the instructions specify to add the following to LocalSettings.php:

require_once $IP . "/extensions/FCKeditor/FCKeditor.php";

However, the filenames in the Linux distribution are all in Lowercase. This may be implicated in the SpecialPreferences.php hack which contains the following instruction:

$this->getToggles( FCKeditor::$nsToggles ) . '</fieldset>'

These errors prevent new installations going smoothly.

[Wiktor Walc]

Extension files and directories inside mediawiki_fckeditor_ext_N.tar.gz have upper case FCK in their names. I have added directory structure to the integration guide: ​http://mediawiki.fckeditor.net/index.php/FCKeditor_integration_guide

Please be sure that you have downloaded FCKeditor extension, not FCKeditor itself.