Tune up Mediawiki v1.21 Installation for a Personal Usage

As the topic implies, we’ll be tuning up a default Mediawiki v1.21 installation for a personal usage.

1.21.5 is the latest stable legacy version of the Mediawiki 1.21.x family and will be discontinued in May 2014. This version should be replaced with a future version of Mediawiki 1.23.x (LTS), which is due to be released in May 2014.
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